I'm not necessarily talking about 13 - 15 yr old boys, but older teens/20's. It's not beyond the realms to assume that Mandy et al may have partied with men of all ages. When I say partied with I mean just that, not had sex with.
Yes we know Mandy ended up with a wrinkly old man for a Husband, but we don't know for definite that she didn't have any male friends closer to her own age.
I'll say it again, we weren't there, we don't know.