A threesome is 3 ppl having sex all at once. It can be 3 of the same sex or mixed. The most commonly fantasy is for one guy to be with two ladies, but many women also have a fantasy about being with two guys.
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You can never have a threesome but you can have a twosome. To have a two some is if you put both penises in you virgina or butt whole. The only way i know to have a threesome if you put two penises...
A threesome is a group of 3 people or things, depends on how you are applying the term.A good article on the subject (assuming you are talking about a sexual threesome) can be found at...