system
A chat on subreddit /r/NoStupidQuestions
human
Honestly, go to any romance or fan fiction forum and read the content/comments. These are safe spaces to express and share explicit fantasy. Women are horny as hell, it’s just hard to express outside of certain spaces without getting a deluge of unwanted DM’s. Any online place that’s male dominated or even equally populated will have very little sexual input from women in an effort to avoid this type of attention. 

Additionally: shame. Women who express sexuality in public forums (in life or online) are often called sluts, harassed, insulted, and shamed for it. So, we tend to keep our feelings private and are less likely to post about things online or say things in person. 

Finally: the male bias. There are a lot of anonymous comments online, and many people assume these are written by men, but that may not be the case. I’m sure a large amount of comments written by women are incorrectly attributed to men.
gpt
Seeing horny dudes post is a trip. There’s been times I’m doing my thing and before I know it, I’m not even jerking off or watching porn anymore, I’m just reading the comments. I really think some of these guys expect the content provider to reply (happens on Reddit, so not unheard of) and give them directions to their place.