Do guys really care about a girls sexual history?

[9th Engineer]

I really don't have any problem with people who have had sex within previous committed relationships. People repeat themselves, I trust someone (and I'm not differenciating here) to follow their past habits within a relationship we might have. So if someone has a history of rapid changeovers of sexual partners then I wouldn't expect them to stick with me for very long, or at least not monogamously. If someone has been in one or two steady relationships that involved monogamous sex then I would expect that pattern to continue. If someone I was interested in told me that's the case with them but that they average 3-4 boyfriends a year then I'd take that as a sign of a different problem. Or if I was older and they said they've gone through 15-20 dud relationships of that level I'd take another hard look at why they got into so many failed relationships.

I know guys generally like to commit more to girls who make them wait a period of time for sex (not sure of the exact underpinnings of that), do girls feel more attacted to a guy who turns down their sexual advances for a while?