That is probably more true for men than women, but I've met a few women who feel that way. Still, if the sex is bad, I do not want to keep having sex with the same woman, when I know I can find good sex out there. My current fuck buddy is pretty great in bed, and does not have the time, nor does she wnat the stress of pursuing a relationship right now, and likes to fuck a couple times a day so its a nice arangement until I find a girlfriend.
It cuts down on the risk of catching something, but I still get most of my needs met.