One wonders what the refractory period is for a super-powered Kryptonian. Maybe Alanah Rae knows. If someone doesn't want to call attention to every aspect of their physique the appropriate answer is not to wear a skin-hugging outfit to begin with. The only explanation for wearing these kinds of outfits that makes real psychological sense is Farmer's; ie, that it's a sexual fetish for these guys. Since no one associated with these properties will ever go there, we're stuck with a variety of less plausible, highly arguable rationales.