I was watching an "in depth" (yeah, I know - pun

) interview with one of those "male-confidence" builders.
He said - for sustained effect - buy a Porsche
The drugs works often in two ways - psychosomatic and real effect. Side effects might be increased heart rate (Hey - I get that without drugs when in such circumstance

) but also conflicting results due to use of other drugs and sometimes allergy reactions.
All the other physical methods are temporary or involves surgery which will alter other parts in such a way that what you gain in length or girth will act negative on angle or durability.
I say - if it aint broken - don't fix it...