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1.
When the balls of 2 male participants in a threesome touch. Making them gay.
"Its not gay unless the balls touch."

Balls are touching
by Cyphaer April 11, 2007
 
2.
The necessary and sufficient criterion for homosexuality (i.e., it's gay if and only if balls are touching).
A pool table is the gayest thing in existence, since balls are touching.
by miji December 14, 2007