Look, imagine you maintained a FRIENDSHIP
with someone you had sex with...
The Big Bang Theory Season 2, Episode 21
Thank you for walking out
on our FRIENDSHIP!
The Big Bang Theory Season 11, Episode 11
You can't ruin a FRIENDSHIP
with sex.
The Big Bang Theory Season 5, Episode 1
as Schrodinger's Friendship.
The Big Bang Theory Season 5, Episode 5
Friendship.
The Big Bang Theory Season 7, Episode 13