Here is a great read a friend found and sent to me. It discusses how mutual masturbation has been rising even among straight men and is not so much a gay thing as simple a reflection of shared interest in cock pleasure and ejaculation.
Just as with sports, working out and other hobbies, guys are finding benefits in getting together with other guys to support each other and help them take masturbation to the next level. Nothing gay about it.
https://www.pinknews.co.uk/2018/12/20/mutual-masturbation-isnt-gay-straight-men/
Marti