User blog comment:IamJakuhoRaikoben/Chapter 508: Pleasure and Agony, Review./@comment-1721267-20161031164941

I think his magic is more than just 'they are affected because they had sex'. This character is to do with holiness. In the bible, the forbidden fruit is something that you want but can't have/have done something wrong. The 'having sex' thing doesn't make sense for several of those characters - for example, I thought Jellal had been saving himself for Erza?

Crime Sorciere committed many sins. Zeref killed thousands of people. Mavis used dark magic. Laxus betrayed his friends and almost killed some of them. Eileen killed tons of people. The majority of the guys in FT are perverts (Macao, Wakaba, Laki has some weird fetishes,..). Gildarts cheated on women (and is a big pervert, too). Minerva turned into a demon. I would assume Rogue got affected because he touched her, despite her telling him not to, and he got affected as a result.

This is just my theory; I do hope that Hiro won't make his magic as simple as it seems on the first glance.