From age 18 to 21 I heard "I like you as a friend" over and over but never could get a woman to sleep with me. They all would tell me their most intimate secrets and let me know what jerks the men they were screwing were. Simply put I was too 'nice'. Eventually I got sick of that and started treating women like they were annoying pests and lacking in intelligence. guess what happened? I lost my virginity. After I broke up with my 1st girlfriend I resumed the joking jerk routine and had no shortage of sex partners.
I’m sure there are girls who do that. I can’t get inside every girls head to know what all their motives are. But I can speak from experience. And I’ve had girls that I considered to be good friends, turn and want a romantic relationship with me. And when I didn’t reciprocate, there went the friendship. Yup, exactly!
If I were a girl I'd be blunt. I would have straight up told him I didn't feel sexually attracted to that person. His argument about casual sex makes sense from a logical standpoint, but he forgets that that sexual attraction isn't logical, therefore logic can't be used to define why one person would do ___ with this person, and not with another.