Guy meets girl in a bar. They get on really well, laughing and talking, joking with each other.
It get's later and the drink is flowing and the couple become very friendly indeed.
It's obvious from the way they are talking and touching that they are very attracted to each other.
Eventually the guy says: "look, why don't we get out of here and go back to your place and make mad passionate love all night long?"
The girl replies "well, I am very attracted to you and ordinairily I'd jump at the idea but I'm afraid I'm on my menstrual cycle tonight"
Guy says "That's no problem, I'll follow you home on my Honda"