I never get this. If any guy is getting this its because of something he's doing. He is probably coming across as too much of a "nice guy"/provider.
Trust me, all women are very sexual. They LOVE IT MAN. The ones you think are nice lil church girls are doing guys super freaking nasty style and screaming porn like lines at him. They want to be sexed in public places or the woods. There is no nice lil women who don't want hot, nasty sex. Every freaking womans magazine is almost totally about sex. Trust me these women want to be taken big time just not by some "nice guy". She doesn't think he'll even have it in him to do her that way. Is he going to change that image now or keep going down this same path as 90% of White men in Western Society?
A guy with the provider frame will actually cause a woman to react this way. They will also try to use him and start asking him to buy dinners or help her get her oil changed or blah blah blah. I do occasionally buy a dinner, but ussually only after I've already slept with a woman at least a couple of times. Even then it's not always such a great idea because it confuses things if she's just a FB.