Top definition. When a group of three people join together for sexual pleasure. My best friend asked me to join she and her husband for a threesome.

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Webster probably does not have an active sex life. The R-rated definition of a threesome is when three people have sex with each other. According to Dr. All three may be single, or the situation may involve a couple inviting another man or woman into their bedroom. While the idea of a heterosexual couple looking for a so-called 'unicorn' — a single woman willing to join the couple — some couples extend an invitation to single men. Threesomes, unlike golf, are non-exclusionary.
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After all, when three people are involved, there are a lot of limbs, holes, and mouths to position. As for the emotional side of things—well, just make sure you communicate about it before and after. Everyone gets a fine-ass view if you arrange yourselves thusly: M enters you from behind, your upper leg draped back and over their hips. The other F lies on their back so their V is within kissing distance from your mouth. You can watch each other, and your bestie is tasting distance away. Lie next to each other and make out while the man kneels between you, fingering you both with extra-lubey hands.
I t was over dinner when it dawned on Matt that he might be having a threesome that night. He and his partner were out at a restaurant with her friend, another bisexual woman. The idea of a threesome came up again over dinner.