not saying that your ides are crap though
anyway I got the idea while reading the "why get f***ed" thread because playing as a male or female both have their advantages so I just thought how about a game where you take control of a lusty Ditto? because this way the main character can be a male, female and anything in between! I have no idea what the general goal of the game would be but you can bet your ass that you'd achieve it by f***ing everyone
but the thing is every pokemon has it's own preferences before it lets you f*** them so being a Ditto you have to set out and find what you need to transform into to match the pokemons preferences, f*** said pokemon, recieve quest related item and so the story progresses. but because of how Dittos transformation works there's no transformation storage bank and that's what makes the puzzles more complex because you can't transform any time/where you want, though there'll probably be a cheat or secret to get one. and hey maybe we could even fit in some non-sex related puzzles in there too like flying or digging to certain areas to find new pokemon and such.
oh and just for the heck of it here's a quick drawing of my Ditto!