He asked her
during COITUS.
The Big Bang Theory Season 5, Episode 24
That woman not only had
vigorous COITUS with Bert
The Big Bang Theory Season 10, Episode 16
Also, if they did have COITUS, we'll
all be needing a skilled psychiatrist.
The Big Bang Theory Season 10, Episode 1
the obvious answer is,
they engaged in COITUS.
The Big Bang Theory Season 5, Episode 1
And then after dinner,
we will have birthday COITUS.
The Big Bang Theory Season 11, Episode 11