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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
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