Adults in a MATURE relationship.
The Big Bang Theory Season 8, Episode 6
...now you're more MATURE.
The Big Bang Theory Season 8, Episode 20
Yes, and I think it's pretty
MATURE of me to admit it.
The Big Bang Theory Season 11, Episode 11
That would be
the MATURE thing to do.
The Big Bang Theory Season 11, Episode 15
Very MATURE.
You're lucky I'm out of Silly String.
The Big Bang Theory Season 6, Episode 22