>>8529200I always prefer clothed or at least partially clothed sex to fully nude sex, because clothes provide a level of visual personality and uniqueness to each character. Even if you don't read the text itself it's usually immediately obvious what kind of person they are, or at least what occupation they hold. And yeah, I also love the idea of splattering clothes with semen, because it carries an additional subtext of dirtying the outfit that the female uses for professional or daily use, and every time they put it on from there on out they'll remember the gangbang or even start to get wet at the thought.
But the previous anon is right that it's hard to look for and at best it's in game CGs that you find such things, and clothes tend to be removed or open fairly strongly even in initial sex scenes. In fact, I think part of the reason I found a liking of partially clothed gangbangs is because fully clothed was too strict a requirement to find much material, so it grew out of midway-compromise sour grapes.
Plus, I can get the mindset of many artists when they draw gangbangs with nearly nude or nude females: clothes are associated with normalcy and whatever life the female had prior to the gangbang, and showing her bare body is meant to parallel how she sheds her regular self to the hidden one of sex, whether willingly or not. That, and being fully clothed tends to miss out in showing the bits that people look at porn for, hence being a lot more common to see, say, a female with nothing on below the waist, or their shirt torn open to reveal their breasts, than fully clothed sex.