Yes. Since their RELATIONSHIP
became carnal...
The Big Bang Theory Season 3, Episode 4
Well, I don't know how you have
a RELATIONSHIP without talking.
The Big Bang Theory Season 5, Episode 13
who doesn't need to fill the holes
in their RELATIONSHIP with a third party.
The Big Bang Theory Season 10, Episode 18
If you were in a non-emotional
RELATIONSHIP...
The Big Bang Theory Season 2, Episode 21
Are you seeking
a romantic RELATIONSHIP with me?
The Big Bang Theory Season 10, Episode 24