It might complicate your friendship if your friend ever found out and he would probably be pissed, but it's your choice. I did and it worked out ok. We're still good 10 years later but I think this is the exception, not the rule. Search this thread only Search this forum only Display results as threads. Is this acceptable at all? Go for it.
Hooking up with your friend's sister...
Y ou can split the paramour-of-choice into two groups:
Recommended Questions. If you wanted to date her, that's one thing. Sleep over if your best friend isn't present.