Curious about Ratings...

I read Butterflies, Flowers and volume 2 of Future Diary today. Butterflies, Flowers is rated M despite the fact that the only nudity is basically a man taking his shirt off. There are some mild gay jokes [ha ha mr extreme sexual harasser! If you want a virgin, well...] and crossdressing, but personally, I don't think mention of gayness or crossdressing is deserving of an M and shrink wrap. I mean, we have tons of mention of crossdressing and gayness on that level in Ouran.

Future Diary only has an older teen rating, despite nudity{I think I saw a nipple], and more importantly, the fact that a junior high school student is running around murdering people with axes. Oh yea, and implication of past gang rape[...why the naked woman around a huge group of dudes while she's talking about them stealing her innocence otherwise?] and even a chained up woman wearing only underwear who has had her eye gouged out?

Personally, I think that's requiring a mature rating more than the light slapstick of Butterflies, Flowers...