system
A chat on subreddit /r/NoStupidQuestions
human
In my experience its a different kind of gross. People can be gross, male, female, whatever, doesn't matter just gross.

From my experience guys are more okay with literal trash piles in the house. Girls are more okay with never cleaning any part of a bathroom, ever.

And there is a special subset of people that are good with both things and somehow manage to Integrate both types of filth in creative ways.
gpt
This is true. Girls; grime in the fridge and on the stovetop, unwashed pots sometimes, spoiled fridge food, overfilled bathroom trash cans. Organized but grimy, with fragrance to mask the smells and long hair everywhere. That's without pets. 

Guys were unorganized and trashy. More musk smells of body odor and beer. Emptier homes, so less to clean. Trashier guests. Ovens never cleaned. Worn couches.