a) When a man has penis-in-anus sex, penis-in-vagina sex, and receives oral sex with a single woman in a single lovemaking session.

b) When a woman has three orgasms in a single session of lovemaking, occurring during vaginal penetration, anal penetration, and oral stimulation respectively.

Note: When both of the above conditions are met in a single sexual encounter the event is called a double hat trick. If this happens on a first date it is a clear sign from the gods that these people should get married within 24 hours.
"I told my girl I'm gonna give her a Venusian hat trick for Valentine's Day."
- a fifteen-year-old boy lying to his friends
by Wolfram T. Swordfish April 11, 2014
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