Interesting thread. I have often considered my self a male slut because I really did and do go for sex at the drop of anything. My ex-b/f 's mother once called me a man whore to my face, but that was a reference to her belief that I made her son gay.
I came of age when the closet was a survival tool. So bath houses and cruise areas and bars were where I went. The encounters were quick, easy, good and no strings. Over time I had a list of guys I knew I could meet in one place or another for a hook up. Yet, for many of them I knew nothing about them except their "name" and where they hung out. Over time some of them were regular and became friendships, but never relationships.
Even after coming out, I continued that pattern except when I was in a relationship.
I can't say I looked or dressed any differently than anyone else. I did not wear a scarlet letter, or carry a green stamp dispenser.
Young guys today live a different life in some respects. It is amazing the changes I've seen in my life. I'm 59, and started seriously cruising when I was 18.