This is regarding the "talk about sex" part.
You don't have to talk about sex in order to just get sex, right, what about substituting something else just to make a girl horny?
For example: girl with big breasts.
Me: making a comment on how big her breasts are, and then a question "What age were you when your boobs stopped growing?"
This should beat commenting on breast size, and then asking her how often do guys tell you that.