Ohhh, for me I think it's kinda more that I'm very picky for certain kinks rather than them not being popular. I think specifically of forced creampies but like, it's the person receiving the creampie that doesn't let the other pull out. I'm really into that but picky enough that a lot of examples I see don't really do it for me!
I'd like to see more good robot stuff too, which I guess is part of why I commission or write that stuff when I can lol