This site is a psychological and sociological study of the phenomenon of mutual masturbation.
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Mutual Masturbation Index
These men are group masturbating, also known as circle jerking. The circle jerk is another common form of mutual masturbation. It is defined as "more than two people masturbating at the same place and at the same time". Group masturbation often involves some type of competition, such as comparing to see who has the largest erection, who ejaculates first (the fastest), who ejaculates the most, who can shoot their semen the farthest.
Competing and rewarding each other for who can ejaculate the fastest is a concern in our study because some other studies indicate that the reward for masturbating fast tends to reinforce a quick orgasm for a man. This can be an issue if the man develops a psychological premature ejaculation issue during sex.
Note that since the phrase circle jerk has become so widely accepted as a term for any group mutual masturbation, the circle jerk method is not necessarily performed in a circle, but it can be. An alternate term for this is called a line jerk, where more than two men are standing in a line masturbating each other, sometimes facing each other.