This is also noticeable in porn. There are all types of famous female portstars, but 99% of male pornstars fit into one or two categories.

Their are subs devoted to women that are white, black, asian, latina, short, tall, petite, curvy, fat, old, young, big breasts, flat chested, women with deformities ...etc

Take into consideration that men are way more open about such things and might more prone to voice their opinion over what they like.

Straight porns first and foremost target audience are men, if you look at gay porn, there will be a lot bigger variety of actors that also come with an equal variety of looks.

It's similar to subreddits, I'd claim that there are more men using reddit than women and again, they are more open to voice their opinion.