Then Alt 4 should be them fucking behind a curtain. Leaving room for imagination and porn generally don't work well together. Being explicit is porn's fundament.
Now don't give him any ideas. On a real note, could just be variety. As someone said, if it's a fire outfit why not slap it on? Now if it's the whole thing I get your point but if it like the top half or vise-versa, could be different. Take for example the mini skirt. Some people would be down/ok with having that on. I guess it's the same thought process in it. Maybe dude has the ult made for himself he just releases it idk lmao