"You think you're doing
a favor by being in a RELATIONSHIP with me."
The Big Bang Theory Season 3, Episode 7
Oh, please, you're barely interested in
a physical RELATIONSHIP with one person.
The Big Bang Theory Season 10, Episode 5
...if we should actually engage in coitus
at least one time in our RELATIONSHIP.
The Big Bang Theory Season 4, Episode 5
and let her know
that I'm in a RELATIONSHIP.
The Big Bang Theory Season 9, Episode 14
our RELATIONSHIP exists
The Big Bang Theory Season 5, Episode 5