Sales are the result of many different variables, the main one being *how good the game actually is*. I predict BG3 will be a good game and will sell well. The sexiness of its characters will probably play an insignificant role in how well it sells. You can find games with pixel graphics being loved for their good gameplay, mechanics or story and selling tons of copies as a result, and on the other hand you can find games with hot babes in bikinis rendered with near-realistic precision ending up making making no profit at all and being disliked by players.
I'd rather my characters, be they male or female, look badass rather than sexy. It won't make any difference sales-wise. And if done well you guys won't even notice it.