Two blondes are in a lift together. "Hey, there's some semen stuck to your face.", says one of them, poining at her own left cheek. "What? Really?", the other blonde exclaims and touches her right cheek in shock.

"No, on the other side!", replies her friend.

"Oh, thank you!", says the blonde, puts her finger in her mouth and starts scraping the inside of her right cheek.

*Not sure if this works in writing, you kinda need to act this joke out...