sex gambling

1) when you bet on the first position used in a pornography.
2) when you bet how fast you will cum while having sex.
3) when you gamble on who will cum first in group sex.
anything like that

Dave: "I bet you she will suck his cock first",
Bob: "no way he will fuck her immediately",
George: "are you guys sex gambling?",
Dave: "yeah",
George: "sex gambling is who will cum first, morons",
Bob: "also, and also who will cum first if me and Dave fuck you"

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