Is it statutory rape in Missouri if the boy was 18 at the time and the victim 15?

Answer 1

Missouri

§ 566. 032 (1)

§ 566. 034 (1)
First-degree statutory rape to have sexual intercourse with another person who is less than fourteen years old

Second-degree statutory rape for someone at least age 21 to have sexual intercourse with someone who is less than age 17
Five years to life in prison

Up to seven years in prison

Answer 2

No, it's child molestation in the second degree, which is a Class A misdemeanor, unless it's a second or subsequent offence, or violence was involved, in which case it's a Class D felony.

EDIT... to "I know"
You missed the relevant law - he said the boy was 18 and the girl was 15, so the Statutory Rape laws don't apply.
566.068. 1. A person commits the crime of child molestation in the second degree if he or she subjects another person who is less than seventeen years of age to sexual contact.

Richard