I have a couple straight male friends, half of them I'm friends with because I'm friends with their girlfriends so I met through them and became close. In my general friend group there's 2 straight males that I'm great friends with. But I'm a lot closer to straight females.
In my current group of friends all are straight with GFs the 5 of them. Also I went to a boys only high school so most of my friends from there are also straight