
You know, when one male dominates
another, his TESTOSTERONE level rises.
The Big Bang Theory Season 6, Episode 6

Not his
TESTOSTERONE levels.
The Big Bang Theory Season 7, Episode 7

Dips in TESTOSTERONE
can cause irritability.
The Big Bang Theory Season 9, Episode 21

...you might be getting
a TESTOSTERONE level.
The Big Bang Theory Season 6, Episode 6

If Sheldon's TESTOSTERONE dipped,
he'd become a butterfly.
The Big Bang Theory Season 9, Episode 21