nt, not sure I can come up with a word that starts with that. So how about

nature

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"In my sex fantasy, nobody ever loves me for my mind."
Nora Ephron

“Clinton lied. A man might forget where he parks or where he lives, but he never forgets oral sex, no matter how bad it is.”
Barbara Bush

"You know that look women get when they want sex? Me neither!"
Drew Carey