my brother is 18 and dating a 15 year old girl. her parents approve, but if they changed their mind, couldnt he get in trouble for even making out with her? i guess my question is what is the definition of sexual conduct?

2907.01 Sex offenses general definitions

(A) “Sexual conduct” means vaginal intercourse between a male and female; anal intercourse, fellatio, and cunnilingus (oral sex) between persons regardless of sex; and, without privilege to do so, the insertion, however slight, of any part of the body or any instrument, apparatus, or other object into the vaginal or anal opening of another. Penetration, however slight, is sufficient to complete vaginal or anal intercourse.

(B) “Sexual contact” means any touching of an erogenous zone of another, including without limitation the thigh, genitals, buttock, pubic region, or, if the person is a female, a breast, for the purpose of sexually arousing or gratifying either person.

(C) “Sexual activity” means sexual conduct or sexual contact, or both.

2907.04 Unlawful sexual conduct with minor.

(A) No person who is eighteen 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 thirteen years of age or older but less than sixteen 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 divisions (B)(2), (3), and (4) of this section, unlawful sexual conduct with a minor is a felony of the fourth degree.

(2) Except as otherwise provided in division (B)(4) of this section, 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) Except as otherwise provided in division (B)(4) of this section, if the offender is ten or more years older than the other person, unlawful sexual conduct with a minor is a felony of the third degree.

(4) If the offender previously has been convicted of or pleaded guilty to a violation of section 2907.02, 2907.03, or 2907.04 of the Revised Code or a violation of former section 2907.12 of the Revised Code, unlawful sexual conduct with a minor is a felony of the second degree.