I can even give it ^^ "See No Evil"
is a game where you awake in a after Apocalypse world (and the capital A is meant), where the world has become hell.
You can submit at the demon king as soon as you meet him (ending the game) or fuck and be fucked by 5 demons to have a better ending using a powerful sexual energy fueled ritual...it's drawn like a comic, so in B/W and the characters are between muscular and bear.
It's an graphic adventure game, so to proceed you have to pick up object and use them on the NPC or say something specific to trigger the sex scenes and the collection of sexual energy.
Remaining on the "light" side but not "rainbow guns" there is Coming Out on top
, a gay dating game made by a western author, so the style is not the usual "manga/anime", the boys are hot and the game itself is good.
They just updated the game to the 1.3 version, adding also a bear character and the possibility to trigger some other sex scene with the basic boys.
It must be out even a "rainbow guns" themed game, and other graphic adventure, but as I wasn't interested I read only the news some time ago... never searched for it.
These are "serious" games... then there are the usual flash game and the "less serious" IMHO, however rather enjoyable, like the textual adventures made by fenoxo (they are freely downloadable in his site http://www.fenoxo.com/
) and the one made by Wahn, Flexible Survival (you need Gargoyle, a gblorb file decompiler to play it).
Fenoxo has three games: Corruption of Champions a classical GdR is officially on hiatus, but if you search you can find a "mod" that expand and complete the story even if it's not finished by Fenoxo himself. Trails in Tainted Space (or T.I.T.S.) is a similar game but in space. This is currently in developing. Fall of Eden is written by Eden, but host by Fenoxo, is very similar to CoC, but it's made with PHP and HTML so you can play it also on smarphone (the others are Flash). In FoE there are some very good character and sex scenes, but is smaller than CoC.
Those have the main focus on body modification and furry characters (male, female, gay, lesbian and herms), so they are only for those that are into these things... the description are usually good even if the subject is furry (at the end the focus is usually on the cock and the muscles and the sex itself, so furry or not is not much different) so I enjoy them time to time...