BloodRayne - a franchise so successful it had two games and then disappeared completely until recently there was a low-budget sprite-based spin-off. This seems to be the fate of many "fanservice first" franchises. Well, without the low-budget reboot thing.

Tomb Raider - the reboot is apparently the best selling Tomb Raider ever. It also has the least sexualised Lara ever.

I know "Sex Sells" is the conventional wisdom, but like so much conventional wisdom it may not actually be as true as marketing departments all over the world believe it is.

You are correct when it comes to modding communities - porn is one of the favourite past-times of the internet, it sometimes seems. But I'm not sure how many Skyrim buyers bought the game just for the inevitable nudity mods.