Legally yes.
It's really odd, though, that the 18-year-old wouldn't want sex.
no.
No. It's not illegal. If they DO show sexual intention, though, then it is illegal. As long as they aren't, then no, totally legit.
you can date date them but the law says that you can not be in a sexual relationship with them my brother was 20 dating a 16 year old girl same thing
Yes.
how is it possible
it isn't illegal to date, but it is illegal to have sexual intercourse.
To date - yes. To have sexual relations with? That's a whole other question.
Yes, as long as you are genuine about no sexual activity.
You first meet. Then you date. Then you marry. Within one year the sexual response goes away.
Sexual intercourse is illegal between a 15 year old and a 21 year old. Hanging out or dating someone is not illegal so as long as there is no sexual intercourse, it is fine.
So long as the relationship is not sexual.
Yes if there is nothing sexual happening