Ive been asked out before by guys who wernt virgins and i wasnt that bothered that they have had sex with someone else it was the fact that maybe they would expect me to have sex with them straight away so i just said no to going out with them. I didnt tell them that was the reason though. Made me feel kinda stupid.
I don't think it's stupid. I always felt awkward when I dated men who had many sex partners...exactly why you said, like I was expected to join his #.