I mean, it really depends on what we're looking at as the cause. If (for example) a guy is physically impossible of producing the testosterone needed to be straight (and thus, he's gay), then shouldn't he get supplements that help him in that regard? That's really not THAT far off from how a lot of mental disorders are treated, and IMO homosexuality and gender dysphoria should be treated as mental disorders.

That said, there's a lot of other ways to increase your testosterone, so those supplements should be the absolute last resort.