I searched "women" via subreddits by name. The top results weren't subreddits for women or even ones that had the word "women" in the title - they were mostly porn. (NSFW titles)
TwoXChromosomes
Jizz to these sluts: young and old, white and black, amateur and pro pornstars
cock
Cock_magic
nsfw
gonewild
xray
HardBoltOns
WarriorWomen
mildlyinteresting
AsianLadyboners
WarriorWomen