San Francisco Backdoor

When a man warms white wine in his mouth and spits it into a woman's rectum. As the wine loosens the fecal matter, the man ejaculates inside the woman's butt. The backdoor is complete when the woman returns the wine into the man's mouth.

This is the same as a Turkish Backdoor, but with wine. Proponents of the San Francisco version claim the wine loosens more fecal matter than the Turkish version with water.

"Did you give her a Turkish Backdoor?"
"No, she wanted a San Francisco backdoor?"
"How many Backdoors are there?"