Perhaps this statement is true, but is the end goal for both parties the same?
For some reason, I find myself befriending mainly females (I am male). Yes, I have a high ego. However, I can never tell if the other person is interested in a friendship or something more. I always want to put them in the friend zone, but I have awkward situations in the recent past where these friends have either made subtle and not-so subtle advances. I am not interested in anything more than friendship. I do not want to lead anyone on. So yes, perhaps that pairing works well, but is friendship the goal?
In addition, males tend to bond during "experiences", so what I have been seeking as of late is more male friendships. Other males are more inclined to go on multi-day backpacking adventures. According to this study, males with low-ego are likely to become friends, but I seek high ego/high energy friends.