Sexually Related Humour

A member of my family many years ago had a van with a bumper sticker he bought & put on the rear bumper.
It read : SEX INTRUCTOR _ FIRST LESSON FREE
An elderly member of the family disapproved of it & said if he removed the sticker, he'd give him $20 to. In those days (1970's) $20 bought a lot of petrol.
Needless to say, that sticker got quickly removed lol
Has any one seen any type of humour that was related to sex or could be taken either way?

 

My neighbor has a tshirt that says "your face is making my penis soft" LOL

 

I saw a young guy a few months ago with 'Orgasm Donor' on his t shirt.
He had a female with him as well - don't know if he or she bought it lol

 

Your dick's so small, I haven't laughed that hard since I saw your nuts...