Wikipedia says:Utah
The age of consent in Utah is 18. However, it is legal for minors aged 16 and 17 to engage in sexual activity with partners less than 7 years older, and between 7 and 10 years older if the partner reasonably didn't know the minor's age.[111]
76-5-401.2. Unlawful sexual conduct with a 16- or 17-year-old.
(1) As used in 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 Subsection (2) occurred.
(2)
(a) A person commits unlawful sexual conduct with a minor if, under circumstances not amounting to an offense listed under Subsection (3), a person who is:
(i) seven or more years older but less than 10 years older than the minor at the time of the sexual conduct engages in any conduct listed in Subsection (2)(b), and the person knew or reasonably should have known the age of the minor; or
(ii) 10 or more years older than the minor at the time of the sexual conduct and engages in any conduct listed in Subsection (2)(b).
(b) As used in Subsection (2)(a), "sexual conduct" refers to when the person:
(i) has sexual intercourse with the minor;
(ii) 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;
(iii) 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; or
(iv) 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 of any participant.
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