That you should not be having sex at eighteen.
If you mean eighteen, it is eighteen.
He got an erection. May be true or just an expression of his feelings.
it an erection
Erection
Possibly you mean an erection.
kolakano = erection
The man has an erection.
it means you have an erection
that you are horny.
His penis was erect.
He has an erection. The statement may or may not be completely accurate. It is sometimes used just to express excitement.
It could mean he is getting an erection, or his clothes are uncomfortable, just like when a girl adjusts her bra.