Amnesia is based on a female-male dating sim, Taku. Probably won't be much yaoi hints there.
Speaking of which, I totally bought the game recently for the PSP since it sounded pretty interesting. I haven't played it yet but the game description is something like "Main Cliche female character wakes up without any memories and is surrounded by four hot guys who she must choose between because dammit they are hot! Also something about recovering her memories and something something." Anyway, I'm sure it'll be more fun than that as long as the anime doesn't try to drown the watcher in cliche romance bullshit.
<.< Says the person who bought the game.