It would only be rebound if he and Penny
had actually engaged in physical INTIMACY.
The Big Bang Theory Season 2, Episode 2
details of physical INTIMACY,
bathroom habits...
The Big Bang Theory Season 10, Episode 16
instead of pressuring him to
accept INTIMACY on your terms.
The Big Bang Theory Season 7, Episode 10
...to satisfy your need for INTIMACY.
The Big Bang Theory Season 2, Episode 15
He's battled INTIMACY issues
his whole life.
The Big Bang Theory Season 9, Episode 23