I absolutely find genitals attractive, but in context. I don't think closeups that cut out the whole person are very sexy at all. The best sexy videos or pictures are of people enjoying each other or themselves in my opinion, not of junk on junk with nothing else.
Edit: I asked hubs, and he's of the opinion that just genitals are fine, he prefers a trimmed bush for men and shaved for women, but he's totally into like just a dick and nothing else