As stated above, I am a sucker for the 90s. At least when it comes to anime and manga. I love the way it is drawn. I know, it might look, I don’t know what really but most people prefer newer anime I guess. Anyway, one 90s anime I love, like love love, is Ai no Kusabi. A boys love anime of course. There are some really hot, steamy sex scenes in it but that is actually not why I like it so much. The story is just as amazing as the sex. It’s based on the novel by Rieko Yoshihara.
The story takes place on the planet Amoi, ruled by a computer called Jupiter, which has imposed a number of strict social rules on its population. The Elites, humans that are genetically engineered by Jupiter, occupy the capital city of Tanagura and travel to the pleasure city of Midas, which has a slum called Ceres. They are ranked amongst themselves by hair color with the Blondies being the highest. Under Jupiter’s restrictions, the Elites are all sterile and forbidden from indulging in sexual activities. Blondies and other elites keep “Pets” (adolescents) purely for voyeuristic purposes and they are kept for about a year before being discarded. Further emasculation is seen in the “Furniture,” adolescent boys (that were all once mongrels) who serve the Blondies Iason Mink, a high-class Blondy, runs into Riki, an unusual black-haired Mongrel, makes him his “Pet” which Riki resents being. As Riki learns of the dangers Iason faces by keeping him, he finds himself developing feelings for his master. Focusing on the relationship between Iason and Riki, Ai no Kusabi also explores issues of caste systems and social exclusion.
TvTropes has a lot of interesting info about the anime. MyAnimeList has the usual stuff. There are two versions of this anime; one made in the 90. (92-94), which is my favorite, and then an remake made in 2012.
The AMV is in no way yaoi and is based on a fanfiction about Ai no Kusabi and not the actual novel/anime but I like it a lot and it is very representative for the series I think. It is one of my all time favorite AMVs