Why do we get so much pleasure from Threesomes??

There seems to be a vast pleasure from a threesome sexual
gathering. I am trying to understand both the pleasure
I get from it and that other get too. There is a strange buss
from being with a couple who are both interested in you and
are turned on by seeing you pleasure with thier patner.
Seeing the joy on a womans faces as she sees a man suck her
mans cock, or the delight on his face as your cock slides
into his partner. I just wondered what is was that others
enjoyed about threesomes???

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