I'm sure there would be literally millions of test volunteers should there be someone desiring to conduct said test. Of course I'm sure there would be a couple of pharmaceutical companies that would NOT want that test to be conducted. Though, is it even necessary? I think we know what the results would overwhelmingly be. Piles of buh-BOING!s with only a few sad trombones. Though even if the results were, yes, young hotties are an effective "ED" fix, uh, not like they're going to be lining up to cure sad old man with unattractive wives wieners.
So yeah, that joke is reality. It's not broken dicks, it's gross wives...in most cases...likely.