Did you know what tribbing was? Good, we didn't either. But when a reader emailed us requesting a round-up with just that theme, we took it upon ourselves as professionals to Wikipedia it. Turns out it's basically scissoring!
Only not always with the "scissor" thing. The definition is more general humping, pussy to pussy. And we were so down. Just goes to show that even when you think you're an expert in sex acts, there's still some terminology you've never encountered out there.
Previously: Top Ten Video Archive
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2 asian girls kissing rubbing pussies in scissor on the matt (xnxx.com)