Group sex is a complex equation. When you have an odd number of participants, it can be difficult to crunch the numbers between dicks, asses, hands and other body parts that might come into play. Even if you're lucky enough to have a nice round number of friends, simply pairing off doesn't always add up. Maybe it says something about our porn-addled minds that we think about these things when we watch movies, instead of just enjoying a nice group grope for what it is, but there is one thing we can all see eye-to-eye on. No good orgy scene is complete without a pool. It's the one variable that never changes.

· "2 guys, 3 girls" (Megarotic)

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Send an email to Dashiell Bennett, the author of this post, at dashiell@deadspin.com.