Three women are in a bar, sitting on barstools and boasting about their sex life.
The first woman says “I have had sex so many times I could fit one of my fists up there. “
The second one says “I have had sex so many times I can shove two fists up there”
The third one smiled as she slowly slid down the stool.
This joke is included in the Black Book of Jokes. You can order it from here.