Sexuality is animated by primitive energies and instincts that cannot be reduced to verbal formulas. Nobody who's masturbating or having sex is totally operating in the rational realm, so I wouldn't use the word "evil" if I were you. That applies more to a psychotic predator and reading hentai doesn't make you one.

@Mr. Everwood

Gonna upvote you in hopes you may check it and read this.

I know I'm late, but I was mainly exaggerating, being funny. That said, I also was a bit serious, as there is a part of me that enjoys seeing people break. That seems kinda evil to me. At least in the Oxford dictionary sense of:

"Profoundly immoral and malevolent"

Also I kinda already said a bit of what you said, tho indirectly: "moral exit, just fap". I kinda disagree tho at the same time because I've encountered material where I couldn't fap due to how I felt about what I was reading. I've also had similar experiences with sex--just because I'm horny doesn't mean I don't have an operating moral conscience; primitive energies or no. The rational part of my mind is actually capable of taking away or even adding to the sexual experience, I have found.