Well, two observations:
1. I have never seen or heard a man do this.
2. Men don't invite each other to the bathroom so they can talk while they piss like women do.
Considering many women can't go piss by themselves in person, it makes good sense that many of them would also find it acceptable to do it over the phone. If I had a girlfriend, and she called me from the bathroom, i'd hang up on her right then. That's just weird.
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