
And she found atomic spectroscopy boring.
I wouldn't COITUS her with your genitals.
The Big Bang Theory Season 9, Episode 8

...and naked bodies contorted
in the sweet agony of COITUS.
The Big Bang Theory Season 1, Episode 13

you haven't had COITUS on?
The Big Bang Theory Season 7, Episode 18

...I want to have COITUS with Amy.
The Big Bang Theory Season 8, Episode 1

"Leonard, call me
if you're interested in COITUS.
The Big Bang Theory Season 4, Episode 6