How many people have you slept with?

I asked a girl this question the other day and she told me that it was offensive for me to ask. I dont get it though, I've never had someone tell me that before, nor have I ever had a problem telling a girl I'm about to sleep with. I always gotta check and ask just how many corn dogs been through that cotton patch. So now Reddit, I must ask...

22 years old. 29 women.