Technically,
that would be COITUS interruptus.
The Big Bang Theory Season 1, Episode 1
for after you've had
disappointing COITUS with Penny.
The Big Bang Theory Season 7, Episode 2
"Leonard, call me
if you're interested in COITUS.
The Big Bang Theory Season 4, Episode 6
Frequent COITUS dramatically increases
the odds of fertilization.
The Big Bang Theory Season 1, Episode 15
...I want to have COITUS with Amy.
The Big Bang Theory Season 8, Episode 1