Well I have always been closer with men than woman. Men aren't intimidated by me, accept me for me and do not try to pull the drama stuff I can't hang with. I maintain friendships by talking to them as if they are a friend. It may be very different for me as I was raised with all brothers and was always hanging with the boys.
I am not saying a man did not try the friend approach first to see if it could lead else where, however I nipped it in the butt. ONLY ONCE did I allow a friend to be more than a friend and when the relationship didn't advance, I lost a great friend.
It is all based on communication and the things you do together. It is like a girlfriend you communicate with them and do certain things with them. WITHOUT clear communication, no relationship will work.