The game was always planned to be an M rated game. It was always supposed to have gore and sex. Two years ago David Gaider said he already wrote more raunchy dialog than he'd ever had in a Bioware game, or something to that effect. Aside from that, it probably will be similar to BG, whatever that means.
They decided they'd make more money if they also covered consoles. For some reason, justified or not, marketing believes the potential audience for the game is a bunch of horny juveniles. Developers have assured time and again that the game itself hasn't changed, either because of consoles or the marketing direction, and I believe them. They've pretty much went as far as they're allowed disavowing the marketing campaign.