@neologist,
Perhaps straight/bi men have that anomaly I am not sure I remember the guys in my school were like that and hated me because I was almost intimately close to the girls in grammar school. Patty cake, Jacobs Ladder and jump rope and I always played on the girls team in sports even up into my high school years.
Adolescent boys are scared of girls because of their secret desires. I did not have those hangups so I was free to bond... And perhaps my bonding with girls was a protective mechanism because of my own secret desires for the same sex.