Guys and girls together, mostly. That is what b/g means here, and the creators in it film with a partner. Some work with the same co-star for years, others bring in someone new every few weeks. The mood shifts from playful to intense, and most of it is shot in bedrooms, hotel rooms and rented studios that look like both.
Flip through the photo and video previews on any model's card before you open her page. With 421 models in the category there is plenty to compare, and new names and fresh posts land in the catalog all the time.
If b/g is your thing, you can get a feel for someone's style in a few seconds and move on when it is not a match.