Apr 17, 2010 9:07 PM GMT
Doctor wants to help guy's about how to measure your penis the correct way.
GuynWPG saidWhat's interesting is that the volunteer started 'expanding' a slight bit near the end!
GabeFletcher saidThe Doctor in the clip is Dr Christian Jessen, and he's gay.
I bet his penis was a 'grower' during this demonstration!