Answer:
• Give an excuse and turn the invitation down if he's not into pre-marital intercourse so as not to do anything out of impulsiveness.
• Give in if he doesn't really see anything wrong with that.
• Not accepting and giving an excuse if her parents are strict and don't support those kinds of things.
There are no guardians at home and since they previously had mutual thoughts on intercourse, there is a high possibility of them sleeping together.