There's nothing wrong with happy-go-lucky, if this was any old JRPG, of course. But considreing the time it took place in, WWII, why was Jonathan that happy-go-lucky? Hell, why wasn't he drafted into the army?
As far as sex and nudity is concerned, I just hope it isn't pointless. For pointless sex and nudity, just read the "Castlevania: The Belmont Legacy" comic. Cheap thrills. Not to mention one of the stupidest lines ever associated with CV, Dracula after being resurrected, and is fully nude, raises his hand to the sky and says, "BELMONT! You're MINE!!!". WTF?!! Somehow, I kinda think the writer originally wantd to write, "BELMONT! You're ass is MINE, biyotch!!", though he shortened it.