The Cho Aniki ("Super Big Brother") series was released on tons of platforms in multiple incarnations. It's not rare at all. Versions of it have been released for systems up to and including the PS2.
The gag of it comes from the Japanese cultural view that wanting huge muscles is an incredibly silly and extremely homoerotic pursuit. Bodybuilding is not popular in Japan. The game basically makes fun of bodybuilders and their obsession with protein and excessively masculine bodies (with the insinuation that they do this as an expression of their inner homosexuality).
(Note that in Japanese cinema and pop culture, attractive men are usually very lean and fit, and often athletic, but not overly muscular.)