I prefer the first of the two. Good word play. "Carry On" style .
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The first of the two jokes above is not good. The humor all depends upon the listener knowing the word "anabolic." That's not good comedy. Honestly, how many people know the word "anabolic"? It's a poor joke. To be honest I still have trouble figuring out the connection between "anabolic" and the supposed punchline "nope, just the penis." It's bad comedy.
On the other hand, the second joke fits all the criteria of great comedy:
- it's quick and to the point
- it relies on language that all can understand
- it offers the classic comedy convention of "not what you expected"
- it's sufficiently crude, but not offensive
Joke 1 above was unfunny. No other way to put it.
Joke 2 above is great comedy.
Do you want proof? Over the next few days hit people with those two jokes. I guarantee you the second will get the great laughs. (I know you won't try that little experiment because you don't want to accept that Whirlwind is right.)