For those of you looking for anime that is a bit more mature, like seinen anime, here's a list of the TV Programs Watch for Free with Amazon Prime Free Trial.
These are the most adult oriented, inappropriate for children, pornographic, violent, mature themes, or most filled with sexual situations/suggestions of all anime.
The Most Intense 18+ Anime Series That Are Too Mature For Little Kids. 18+ Mature Anime Series List: That’s right, this is a food/Ecchi series with plenty of “almost naked” scenes and obscene animation.
2 THE ANIMATION. TV-14 - TV Series. Flowers of Evil. Flowers of Evil. TV-14 - TV Series. Fruit of Grisaia, The. Fruit of Grisaia, The. TV-MA - TV Series.