Additional anecdata, and also a woman: I do this for any or all of the following reasons: * (culture) it is polite to leave something for the next person * (

Additional anecdata, and also a woman: I do this for any or all of the following reasons: * (culture) it is polite to leave something for the next person * (I have roommates) I don't want to be the last person who finished something. I would be obliged to replace it. For the typical girl thing, I haven't seen this behavior in real life with my family members or friends. I have heard of the concept on social media.