How would a girl take it, if you told her you were a virgin?
At 40, yes I would be turned off. If I was your girl I would definitely be celebrating. It is so hard to find any guys that aren't sleeping around with a bunch of girls. It's awesome that you don't do one night stands and stuff like that. I'm guessing your girl won't care if you're a virgin but I could be wrong. From experience, the majority of the girls I know wouldn't care.