The biggest thing with me is interpersonal chemistry, the best being love. If I am in love with her, bad sex with her is better than good sex with a hot babe for whom I have no emotional attachment.
Two nights ago I saw a spinner who is moving away, so it was my last chance to see her. I used to see her very often and I developed an attachment to her but didn't fall in love w/ her. Still, we always had great sex. The other night, to watch us, you'd've thought we were making a fenzied-hard-fucking-woman-completion fetish vid. I started fucking her halfway down the bed and pumped her up to the top of it, stopped only by the pillows. Despite fucking literally thousands of men and having sex probably 50,000 times in her life, she almost had to tap out. The orgasms were exhausting her as well as bracing herself against me. Not bragging, just saying how intense and active it was. It was for us both really good sex.
Tonight I am seeing my regular girl. I can honestly say that I fell in love with her the first time I saw her. It was for QS. I came back for FS later that week and she's been my regular ever since. I still fuck other women, and of course she fucks and sucks men and sometimes women too all the time. If it makes her happy, I am all for it. And it does; she is a pro by choice, not necessity. While she doesn't requite my feelings, that is fine. Falling in love is a chemical reaction triggered in the brain. If it doesn't happen, it just doesn't. No one's fault. Anyway, I would rather be with her though she is not a spinner, even though I typically prefer the spinner type. I'd rather have a bad sex session with her than a good sex session with a spinner as described above. (Fortunately my regular and I have never had "bad sex").
That's the power of love, as Huey Lewis sang about.
Removing love from the narrative, I have found that overweight women in general seem to give the best head. (My spinner friend was a notable exception; she took cock deep and loved getting face-fucked.) I am not clear as to why, but they do, porn stars aside, of course. While banging thin chicks is generally more pleasurable bc the body mechanics are better, heavier women can be just as much fun. I am sensitive to how a vagina feels and if she has a really nice pussy, her being fat isn't much of a consideration for me. My regular is a little overweight but I don't care; I still love and want her.