I think there’s a fairly large chance you’re encountering creeps, but I also think there is a market gap.
There’s entire subs of women ridiculing men’s nudes as low effort and not artful. I’m inclined to believe some men feel insecure about theirs and don’t know how to take pics of their junk that women would like.
I’m not saying the consenting woman won’t like it, but a penis alone ain’t the most attractive organ. Paying a pro to take them and set them up “right” could be their answer.
There’s also a double standard with boudoir among photogs. So, you’re probably encountering a mix.
But I’ve been told the bulge is more attractive than the organ. I’ve also been told to take it at certain angles.
Idk, by the individual.