The women's response is normal. My husband and I were married quite a while before I became fully comfortable with him. Which is why I say that 1) casual sex just isn't worth the bother 2) it's much better in a long term relationship.

Now I do not claim to have expert personal experience in this field. I have more fingers than I have had sexual partners. Of those partners only one would I concider an excellent performer, but it took us more than four times to figure out what worked for us. FYI he got worse instead of better.

I do not understand the friends with benefits from the woman's point of view. It doesn't really seem worth the effort imo.