I think age would greatly factor into it. If the guys is in high school or college going years then I think alot of girls probably wouldn't mind, it's a pretty common occurance. Now get a guy in his mid to late 20's or older then.... yeah maybe. Not just because he wouldn't know what to do, but for a girl the taking of ones virginity is usually a bigger deal then it is for a guy. At least amongst the circle I hang out with. Girls want it to be special usually... guys just want to get the poison out. I have actually talked about this with girls in my circle of friends and they said the main reason is because they wouldn't want the responsibility and the possibility of the guys to become obsessed with them and go falling in love. Granted these particular girls are all between the ages of 24 and 30.
Also fun side note, when I was like....19, I got this older girl, she was around 22 or so to have sex with me because I said I was a virgin. I totally lied, which is a bit asshole-ish I agree now, but she was totally into it. In my defense I was pretty wasted and she was the one who decided to up and tell me she always wanted to take a guys cherry. It was probably believable, I wasn't too terribly experienced at the time and the booze has a way to make you a little less skillful seeming. God I would love to run into her again... you know, to show her how my skills have improved over the years. I'm actually adding it to the list of things I want to do before I die.... I don't even care if she loses her looks, I have a goal.