Note by @cookingsteak

I wish straight shota had more plain looking women. Them all having hourglass figures and large boobs is offputting enough for me not to read that many doujins about it. I don't even usually mind this sort of body type usually, but I guess paired with shota it feels less appealing? I don't mind it as much with loli, not sure why. It could be the character writing/implications in the designs.

I also thought it could be that it somehow feels too self-inserty, like you're supposed to be a man reading these and putting yourself in the place of the shota. I don't enjoy putting myself into stories, nor do I identity myself as male, so it could simply be a difference in demographic.