Mutual masturbating is something that practically all men do at some time in their life. It’s fun and it answers sexual curiosity questions. And it has nothing to do with labelling yourself gay or bi or any other identifying tag.
It’s simply about sexual exploration. You have an erection and you’re proud to share it around if others are interested. It’s simply play but don’t tell. And 99% of the times you’ll be appreciated for it by other men who are just as curious as you are!