This is most commonly considered a thing groups of pre-teen and teenaged boys do, but sometimes it might be done by groups of men, groups of girls, groups of women, or groups of people of different ages and include both men and women. In the case of boys or men, group masturbation is called a circle jerk. (Sometimes a circle jerk just means an unnecessary office meeting where nothing useful is done.) Group masturbation circle jerks may be less common for boys today than in the past because boys now have much more information about sex. They might think looking at other boys masturbating is not that interesting because information and pornography are on the internet. Also, sex education classes usually have some information about what is normal. In the past (maybe 30 to 70 years ago) circle jerks often happened at summer camps. Circle jerks were sometimes part of hazing at some schools for boys. Hazing means older students making new students do a lot of things they shouldn't or don't want to do. Today, camping leaders and older students are told they must not allow circle jerks. Circle jerks often were like games, with the "winner" being the boy able to ejaculate first, last, or farthest depending on the pre-established rules. Usually each boy only touches his own penis, but sometimes each boy touches the penises of the boys on each side of him. Many boys today would think of that as a homosexual (gay) thing and would not want to do it. A circle jerk that involves oral sex is called a daisy chain and is a form of group sex. A circle jerk can serve as an introduction to sexual relations with other males, but the main reason or benefit for doing it is that young teenagers usually don't have the chance to have regular sexual activity with another person. In earlier years, many experts did not think circle jerks were bad, and some saw them as educational (educating boys that they were normal) and helpful in building self-confidence. Some of that may be true, but group masturbation may be a problem if some boys, often older boys, force other boys to do it when they really don't want to. It is a very serious problem if men suggest that boys do it. This could have happened at some summer camps. Boys who were in circle jerks might develop problems later. Some men who have relationship difficulties or sexual problems as adults feel their problems are caused by group masturbation they did when they were pre-teens or teenagers. Experts have different opinions, but group masturbation is probably not a good thing for pre-teens and teens to do. Even if it is not a problem for most boys, it might be very bad for a few boys. Some boys who are unsure if they are gay or straight may find it very awkward. Sometimes boys with smaller penises are teased or bullied afterward. Also, there could be very bad problems if anyone takes pictures and shares them on phones or on the internet. If a boy or girl feels a strong need to see if what happens when they masturbate is "normal", it is probably better to do it with just one friend, in person, not with a phone or computer. That way they can see if what happens when they masturbate is similar without worrying about being bullied or about pictures being shared.