C'mon, you know I just added the Rodman picture for the hell of it.
It's funny that we even use the words masculine and feminine to describe the traits we are talking about. But what are we going to do, our whole society is conditioned to think of very polar stereotypes for men and women.
I think for a man to think completely starts with simple awareness. Try and think of how other people feel in whatever situation they are in. Of course, we cannot possibly know every factor affecting how they feel, but the effort is what counts, and with time we hone our skills. Another big thing is listening to people in complete fairness and open-mindedness, without considering gender at all.
If a person is truly aware the preconceptions just melt away and experience leads to thinking as a human being and not a man/woman.