The following information was taken directly from the Utah state legislation website at http://www.le.state.ut.us/~code/code.htm

76-5-401.   Unlawful sexual activity with a minor — Elements — Penalties — Evidence
of age raised by defendant.

(1)For purposes of this section "minor" is a person who is 14 years of age or older, but younger than 16 years of age, at the time the sexual activity described in this section occurred.
(2)A person commits unlawful sexual activity with a minor if, under circumstances not amounting to rape, in violation of Section 76-5-402, object rape, in violation of Section 76-5-402.2, forcible sodomy, in violation of Section 76-5-403, or aggravated sexual assault, in violation of Section 76-5-405, the actor:
(a)has sexual intercourse with the minor;
(b)engages in any sexual act with the minor involving the genitals of one person and the mouth or anus of another person, regardless of the sex of either participant; or
(c)causes the penetration, however slight, of the genital or anal opening of the minor by any foreign object, substance, instrument, or device, including a part of the human body, with the intent to cause substantial emotional or bodily pain to any person or with the intent to arouse or gratify the sexual desire of any person, regardless of the sex of any participant.
(3)A violation of Subsection (2) is a third degree felony unless the defendant establishes by a preponderance of the evidence the mitigating factor that the defendant is less than four years older than the minor at the time the sexual activity occurred, in which case it is a class B misdemeanor.

Repealed and Re-enacted by Chapter 82, 1998 General Session

76-5-401.1.   Sexual abuse of a minor.
(1)For purposes of this section "minor" is a person who is 14 years of age or older, but younger than 16 years of age, at the time the sexual activity described in this section occurred.
(2)A person commits sexual abuse of a minor if the person is seven years or more older than the minor and, under circumstances not amounting to rape, in violation of Section 76-5-402, object rape, in violation of Section 76-5-402.2, forcible sodomy, in violation of Section 76-5-403, aggravated sexual assault, in violation of Section 76-5-405, unlawful sexual activity with a minor, in violation of Section 76-5-401, or an attempt to commit any of those offenses, the person touches the anus, buttocks, or any part of the genitals of the minor, or touches the breast of a female minor, or otherwise takes indecent liberties with the minor, or causes a minor to take indecent liberties with the actor or another person, with the intent to cause substantial emotional or bodily pain to any person or with the intent to arouse or gratify the sexual desire of any person regardless of the sex ofany participant.
(3)A violation of this section is a class A misdemeanor.

Enacted by Chapter 82, 1998 General Session

76-5-401.2.   Unlawful sexual conduct with a 16 or 17 year old.
(1)For purposes of this section "minor" means a person who is 16 years of age or older, but younger than 18 years of age, at the time the sexual conduct described in this section occurred.
(2)A person commits unlawful sexual conduct with a minor if, under circumstances not amounting to rape, in violation of Section 76-5-402, object rape, in violation of Section 76-5-402.2, forcible sodomy, in violation of Section 76-5-403, or aggravated sexual assault, in violation of Section 76-5-405, the actor who is ten or more years older than the minor at the time of the sexual conduct:
(a)has sexual intercourse with the minor;
(b)engages in any sexual act with the minor involving the genitals of one person and the mouth or anus of another person, regardless of the sex of either participant; or
(c)causes the penetration, however slight, of the genital or anal opening of the minor by any foreign object, substance, instrument, or device, including a part of the human body, with the intent to cause substantial emotional or bodily pain to any person or with the intent to arouse or gratify the sexual desire of any person, regardless of the sex of any participant.
(3)A violation of Subsection (2) is a third degree felony.

76-5-402.1.  
Rape of a child.
(1) A person commits rape of a child when the person has sexual intercourse with a child who is under the age of 14.
(2) Rape of a child is a first degree felony punishable by a term of imprisonment of:
(a) except as provided in Subsection (2)(b), (2)(c), or (3), not less than 15 years and which may be for life;
(b) except as provided in Subsection (2)(c) or (3), life without parole, if the trier of fact finds that during the course of the commission of the rape of a child, the defendant caused serious bodily injury to another; or
(c) life without parole, if the trier of fact finds that at the time of the commission of the rape of a child the defendant was previously convicted of a grievous sexual offense.
(3) If, when imposing a sentence under Subsection (2)(a) or (b) a court finds that a lesser term than the term described in Subsection (2)(a) or (b) is in the interests of justice and states the reasons for this finding on the record, the court may impose a term of imprisonment of not less than:
(a) for purposes of Subsection (2)(b), 15 years and which may be for life; or
(b) for purposes of Subsection (2)(a) or (b):
(i) ten years and which may be for life; or
(ii) six years and which may be for life.
(4) The provisions of Subsection (3) do not apply when a person is sentenced under Subsection (2)(c).
(5) Imprisonment under this section is mandatory in accordance with Section 76-3-406.  

76-5-402.2.  
Object rape.
(1) A person who, without the victim’s consent, causes the penetration, however slight, of the genital or anal opening of another person who is 14 years of age or older, by any foreign object, substance, instrument, or device, not
including a part of the human body, with intent to cause substantial emotional or bodily pain to the victim or with the intent to arouse or gratify the sexual desire of any person, commits an offense which is a felony of the first degree,
punishable by a term of imprisonment of:
(a) except as provided in Subsection (1)(b) or (c), not less than five years and which may be for life;
(b) except as provided in Subsection (1)(c) or (2), 15 years and which may be for life, if the trier of fact finds that during the course of the commission of the object rape the defendant caused serious bodily injury to another; or
(c) life without parole, if the trier of fact finds that at the time of the commission of the object rape, the defendant was previously convicted of a grievous sexual offense.
(2) If, when imposing a sentence under Subsection (1)(b), a court finds that a lesser term than the term described in Subsection (1)(b) is in the interests of justice and states the reasons for this finding on the record, the court may impose a term of imprisonment of not less than:
(a) ten years and which may be for life; or
(b) six years and which may be for life.
(3) The provisions of Subsection (2) do not apply when a person is sentenced under Subsection (1)(a) or (c).
(4) Imprisonment under Subsection (1)(b), (1)(c), or (2) is mandatory in accordance with Section 76-3-406.

76-5-402.3.  Object rape of a child — Penalty.
(1) A person commits object rape of a child when the person causes the penetration or touching, however slight, of the genital or anal opening of a child who is under the age of 14 by any foreign object, substance, instrument, or device, not including a part of the human body, with intent to cause substantial emotional or bodily pain to the child or with the intent to arouse or gratify the sexual desire of any person.
(2) Object rape of a child is a first degree felony punishable by a term of imprisonment of:
(a) except as provided in Subsection (2)(b), (2)(c), or (3), not less than 15 years and which may be for life;
(b) except as provided in Subsection (2)(c) or (3), life without parole, if the trier of fact finds that during the course of the commission of the object rape of a child the defendant caused serious bodily injury to another; or
(c) life without parole, if the trier of fact finds that at the time of the commission of the object rape of a child the defendant was previously convicted of a grievous sexual offense.
(3) If, when imposing a sentence under Subsection (2)(a) or (b), a court finds that a lesser term than the term described in Subsection (2)(a) or (b) is in the interests of justice and states the reasons for this finding on the
record, the court may impose a term of imprisonment of not less than:
(a) for purposes of Subsection (2)(b), 15 years and which may be for life; or
(b) for purposes of Subsection (2)(a) or (b):
(i) ten years and which may be for life; or
(ii) six years and which may be for life.
(4) The provisions of Subsection (3) do not apply when a person is sentenced under Subsection (2)(c).
(5) Imprisonment under this section is mandatory in accordance with Section76-3-406.

76-5-403.1.  Sodomy on a child.
(1) A person commits sodomy upon a child if the actor engages in any sexual act upon or with a child who is under the age of 14, involving the genitals or anus of the actor or the child and the mouth or anus of either person,
regardless of the sex of either participant.
(2) Sodomy upon a child is a first degree felony punishable by a term of imprisonment of:
(a) except as provided in Subsection (2)(b), (2)(c), or (3), not less than 15 years and which may be for life;
(b) except as provided in Subsection (2)(c) or (3), life without parole, if the trier of fact finds that during the course of the commission of the sodomy upon a child the defendant caused serious bodily injury to another; or
(c) life without parole, if the trier of fact finds that at the time of the commission of the sodomy upon a child, the defendant was previously convicted of a grievous sexual offense.
(3) If, when imposing a sentence under Subsection (2)(a) or (b), a court finds that a lesser term than the term described in Subsection (2)(a) or (b) is in the interests of justice and states the reasons for this finding on the
record, the court may impose a term of imprisonment of not less than:
(a) for purposes of Subsection (2)(b), 15 years and which may be for life; or
(b) for purposes of Subsection (2)(a) or (b):
(i) ten years and which may be for life; or
(ii) six years and which may be for life.
(4) The provisions of Subsection (3) do not apply when a person is sentenced under Subsection (2)(c).
(5) Imprisonment under this section is mandatory in accordance with Section
76-3-406.  

76-5-406.  Sexual offenses against the victim without consent of victim — Circumstances.
An act of sexual intercourse, rape, attempted rape, rape of a child, attempted rape of a child, object rape, attempted object rape, object rape of a child, attempted object rape of a child, sodomy, attempted sodomy, forcible sodomy, attempted forcible sodomy, sodomy upon a child, attempted sodomy upon a child, forcible sexual abuse, attempted forcible sexual abuse, sexual abuse of a child, attempted sexual abuse of a child, aggravated sexual abuse of a child, attempted aggravated sexual abuse of a child, or simple sexual abuse is without consent of the victim under any of the following circumstances:
(1) the victim expresses lack of consent through words or conduct;
(2) the actor overcomes the victim through the actual application of physical force or violence;
(3) the actor is able to overcome the victim through concealment or by the element of surprise;
(4) (a) (i) the actor coerces the victim to submit by threatening to retaliate in the immediate future against the victim or any other person, and the victim perceives at the time that the actor has the ability to execute this threat; or
(ii) the actor coerces the victim to submit by threatening to retaliate in the future against the victim or any other person, and the victim believes at the time that the actor has the ability to execute this threat;
(b) as used in this Subsection (4) "to retaliate" includes but is not limited to threats of physical force, kidnaping, or extortion;
(5) the victim has not consented and the actor knows the victim is unconscious, unaware that the act is occurring, or physically unable to resist;
(6) the actor knows that as a result of mental disease or defect, the victim is at the time of the act incapable either of appraising the nature of the act or of resisting it;
(7) the actor knows that the victim submits or participates because the victim erroneously believes that the actor is the victim’s spouse;
(8) the actor intentionally impaired the power of the victim to appraise or control his or her conduct by administering any substance without the victim’s knowledge;
(9) the victim is younger than 14 years of age;
(10) the victim is younger than 18 years of age and at the time of the offense the actor was the victim’s parent, stepparent, adoptive parent, or legal guardian or occupied a position of special trust in relation to the victim as
defined in Subsection 76-5-404.1(4)(h);
(11) the victim is 14 years of age or older, but younger than 18 years of age, and the actor is more than three years older than the victim and entices or coerces the victim to submit or participate, under circumstances not amounting
to the force or threat required under Subsection (2) or (4); or
(12) the actor is a health professional or religious counselor, as those terms are defined in this Subsection (12), the act is committed under the guise of providing professional diagnosis, counseling, or treatment, and at the time
of the act the victim reasonably believed that the act was for medically or professionally appropriate diagnosis, counseling, or treatment to the extent that resistance by the victim could not reasonably be expected to have been
manifested. For purposes of this Subsection (12):
(a) "health professional" means an individual who is licensed or who holds himself out to

be licensed, or who otherwise provides professional physical or mental health services, diagnosis, treatment, or counseling including, but not limited to, a physician, osteopathic physician, nurse, dentist, physical therapist, chiropractor, mental
health therapist, social service worker, clinical social worker, certified social worker, marriage and family therapist, professional counselor, psychiatrist, psychologist, psychiatric mental health nurse specialist, or substance abuse counselor; and
(b) "religious counselor" means a minister, priest, rabbi, bishop, or other recognized member of the clergy.

 76-5-407.   Applicability of part — "Penetration" or "touching"
sufficient to constitute offense.

(1) The provisions of this part do not apply to consensual conduct between persons married to each other.
(2) In any prosecution for:
(a) the following offenses, any sexual penetration, however slight, is sufficient to constitute the relevant element of the offense:
(i) unlawful sexual activity with a minor, a violation of Section 76-5-401, involving sexual intercourse;
(ii) unlawful sexual conduct with a 16 or 17 year old, a violation of Subsection 76-5-401.2, involving sexual intercourse; or
(iii) rape, a violation of Section 76-5-402; or
(b) the following offenses, any touching, however slight, is sufficient to constitute the relevant element of the offense:
(i) unlawful sexual activity with a minor, a violation of Section 76-5-401, involving acts of sodomy;
(ii) unlawful sexual conduct with a 16 or 17 year old, a violation of
Section 76-5-401.2, involving acts of sodomy;
(iii) sodomy, a violation of Subsection 76-5-403(1);
(iv) forcible sodomy, a violation of Subsection 76-5-403(2);
(v) rape of a child, a violation of Section 76-5-402.1; or
(vi) object rape of a child, a violation of Section 76-5-402.3.
(3) In any prosecution for the following offenses, any touching, even if
accomplished through clothing, is sufficient to constitute the relevant element
of the offense:
(a) sodomy on a child, a violation of Section 76-5-403.1; or
(b) sexual abuse of a child or aggravated sexual abuse of a child, a
violation of Section 76-5-404.1.