My boyfriend and I have spent weekends and a couple weeks at his parent's house before. We had no problem fucking. Although it was a little hard to be quieter than we usually are. I'm sure the neighbors in his apartment building would love it if we applied that concept to home.

We have also fucked in his apartment bedroom while his parents were sleeping in the living room. That had to be real quiet.

Of course, by that time we had been together for a year or so.