User blog comment:IamJakuhoRaikoben/Chapter 508: Pleasure and Agony, Review./@comment-24784846-20161102032951/@comment-4829046-20161103031744

Oh I am mindful, as I am increasingly viewing the manga from his writing standpoint. However, I know that Mashima will justify it in the next chapter with something else which will make me roll my eyes. After all, he made it so that the 'obvious' was blurred. The spell was pretty much expected to work on EVERY fighter present by conjecture, and attributing it to just having sex goes against the continuity. The only way out is to just say "Oh it works like this.... oh to add to that, having already had orgasms is a definite trigger, definitely." The initial explanation will cover the cases where sexual activity does not always result in orgasm(as many unsatisfied partners can attest to ;)) while the latter bit will cover the humour.