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Someone who is threesexual has no interest in a relationship with another person of the same sex, or indeed in one-on-one sexual encounters with someone of the samesex but who engages in same-sex sexual acts as part of threesomes or groupsex.
'Hey, I saw you giving that guy head at that orgy last night, I didn't know you were gay.'
'Oh, I'm not gay, I'm threesexual, my girlfriend was helping me out with it.'
'Oh, cool'.
by Tulcha April 18, 2017
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