I know....SPERM.
The Big Bang Theory Season 12, Episode 12
I've never reneged
on a proffer of SPERM before.
The Big Bang Theory Season 1, Episode 1
Oh, maybe I could sell my blood and SPERM!
The Big Bang Theory Season 10, Episode 17
You're paying?
Have you been selling your SPERM again?
The Big Bang Theory Season 2, Episode 22
There's some poor woman
who's gonna pin her hopes on my SPERM.
The Big Bang Theory Season 1, Episode 1