Thru my 20s if was hard for me to maintain plutonic relationships with a girl. Flame on. That is if I was sexually attracted to them. Guys already have friends. They don't need more friends to hang out with. What they want is something more from a cute girl. Things change once you mature of course.
"Ah, women. They make the highs higher and the lows more frequent." Nietzsche
There are two dilemmas... that rattle the human skull. How do you hold onto someone who won't stay? And how do you get rid of someone who won't go?