What is Sex Ninja?
1.
A person who can engage in sexual intercourse or masturbation so stealthily that the people in the adjoining room do not suspect a thing.
Dave: Dude, did your parents cath you and whats-her'face screwing last night?
Ed: No way, man. I'm a sex ninja.
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2.
Someone who is super sneaky in bed and doesn't get caught or noticed (Unless they want to be).
"I am a super sneaky
Sex Ninja . I will sneak into your house, Into your room, Take what I want from you, Leave and you will never know I was there."
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