How is oral sex like eggs Benedict?
You seldom get either one at home.
If we're going to go in that direction...
Man walks into a bar and orders seven shots of whiskey.
Bartender asks, "what's the occasion?"
Man says, "I just had my first [colloquial term for oral sex]."
Bartender: "Well, congratulations! Let me buy you a drink."
Man: "Oh, no thanks. If seven won't get the taste out of my mouth, forget it."