(a) No person who is 18 years of age or older shall engage in sexual conduct with another who is not the spouse of the offender, when the offender knows the other person is 13 years of age or older but less than 16 years of age, or the offender is reckless in that regard.
(b) Whoever violates this section is guilty of unlawful sexual conduct with a minor.
(1) Except as otherwise provided in division (b)(2), unlawful sexual conduct with a minor is a felony to be prosecuted under appropriate state law.
(2) Except as otherwise provided in division (b)(3) below, if the offender is less than four years older than the other person, unlawful sexual conduct with a minor is a misdemeanor of the first degree.
(3) If the offender previously has been convicted of or pleaded guilty to a violation of R.C. §§ 2907.02, 2907.03 or 2907.04, or any substantially equivalent municipal ordinance, or a violation of former R.C. § 2907.12, or any substantially equivalent municipal ordinance, unlawful sexual conduct with a minor is a felony to be prosecuted under appropriate state law.
(R.C. § 2907.04)