I agree with most people's sentiments here.
I've had sex with girls I was in love with and girls I wasn't. To be honest, sex with the girls I knew only for that night wasn't mind-blowing. In fact, it could be a little bit awkward because they like getting off in one way and I might like getting off in another. Sex with someone I love is always mind-blowing and gets better and better. If you know someone inside and out (no pun intended
) then the sex can be INCREDIBLE.