We just had sex & he came in like 30 seconds & now he can't get hard. This happens a lot. Where does the problem lie? I think I might be loose or something. But he says I'm not. What!!

He probably just enjoys it too much, I don't believe it has anything to do with being loose.. But if it keeps happening and your both not happy about it, try looking online or ask a doc :)

How old are the two of you?