I don't know what kind of girls you've been seeing, fish, but that don't look like any vulva I've ever seen!  Wow!  Porn these days is so much better.  Must've sucked to be a cave man.  Wonder if there were hookers then?
Cave man: "I want to put my penis in your vagina."
Cave hooker: "That will be two mastodon haunches.  Because I am Top Ten on The Cavehooker Review."

Here's an appropriate tune they might have sung:

I knew she was stone cold, but she did take the biscuit