Well, I guess that is because this forum ranges from ages 7+ and... well it doesn't matter, hentai is hentai, mainly for those who actually hate anime, because no self-respecting anime fan would want to see replicas of their favorite anime characters doing...that.
The funny thing is, perverts usually jump to the conclusion that if a guy doesn't like hentai, or isn't a pervert, then their gay. This would mean that more than 4.5 billion people on earth (not counting females) are gay, which is not true.
It's not his hack, he has the same avatar as another member of PC who is the creator of a hack, and actually a good person (even though still a pervert).