Sometimes, you know. Sex just - it's awkward. Bodies make weird noises and people fall off beds (especially single bunks not designed to hold three people!) and elbows end up in faces and, "Ow, Poe, I don't think my arm can bend that way."
But if you can't laugh with the people you're having sex with while you're having sex with them? Yeah, it's all a bonding experience.
Finn/Poe/Rey or any permutation - Bad (but cute!) sex
But if you can't laugh with the people you're having sex with while you're having sex with them? Yeah, it's all a bonding experience.