Cain
Straussian
I think that would be cheating unless that sort of thing is allowed in bodybuilding, unlike other competitive sports.
Bodybuilding is more pageantry than sport. Steroid abuse is an accepted norm in untested competitions.
I think it would also lead to side effects like growing a beard and possibly baldness in extreme cases.
I think that's the tip of the iceberg. For women, there's a storm of unpleasant side effects in the form of secondary (male) sex characteristics.