http://www.youtube.com/watch?v=EN0kn1FkCFc

thats one to the list ^^^ Maka Maka for the super famicom, based on an adult magna comic book


also nominate Persona 2 innocent sin for having a gay NPC love the main character but the games soon to be in english

Want strange games? Try looking for A-Ga and Battle Raper. Mind you, they're 18+ games due to its sexual intent.
Don't ask me how I know these games, I just do.

Adding to Pesmo's post, try Discipline, Makai Tenshi Jibril, Mahou Shoujo Ai, Sex Friend, and plenty of others saved on my offline pc. Those were hard to get.