
Sheldon and I engaged in INTERCOURSE.
The Big Bang Theory Season 4, Episode 20

when Professor Rothman tried
to have INTERCOURSE
The Big Bang Theory Season 5, Episode 17

...his father and I only had INTERCOURSE
for the purposes of reproduction.
The Big Bang Theory Season 2, Episode 15

...by the fact that I haven't had
INTERCOURSE with him in eight years.
The Big Bang Theory Season 3, Episode 11

I must say, ever since you started
having regular INTERCOURSE...
The Big Bang Theory Season 4, Episode 22