Fantasy.

You had to go with the classic.

And nothing was more classic than fantasy from Tolkin to DnD followed by the endless expanse of variations that grew from those titans in the field or cut their own path in the genre.

Elfin babes, savage buff orcs ladies, dwarven shortstacks, human hotties and more. You couldn't find a richer grounds for hot women outside science-fiction or comics.

Beyond the women, there wasn't a shortage of styles either be it low-fantasy, high-fantasy or pulpy heroic fantasy.

Customization was endless too, as you could create a world without humans and confer benefits to yourself for being human there or a rich world of cultures and races.

Readied, you set your imagination loose creating a world.