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if its a guy and 2 girls one girl suck the guy up , the guy or girl eat the other girl out and who ever is left over play with the other persons vagina or penis.

Answerits simple/ u have three people.
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15y ago

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to have a three sum there must be 2 boys and 1 girl or 2 girls and 1 boy. the 2 same sex people go on to the 1 other person and 1 of them kisses the 1 person and the other on feels the willy vagina or boobs. and the the 2 people swap. its so sexy and it makes you feel really horny. to watch a three sum go to www.porn.com

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15y ago
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Q: How do you have a three-sum?
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