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Mutual Masturbation Index
The men below are engaging in a practice known as consensual frotteurism (also called frotturism, frottage, dry humping, or frot). Basically, frottage is when a couple rubs up against one another so that their genitals rub each other to cause a sensual friction. This can occur between two males, two females, or a male and female couple.
Frot can be used as foreplay before sexual intercourse or frottage grinding can result in orgasm in and of itself. Some people prefer it above all other sexual activities due to the advantage of being able to be face to face and have the freedom of the hands to caress. Frottage is typically considered a safer alternative to sexual intercourse, especially to avoid STDs and/or pregnancy. It is common among both heterosexuals and homosexual couples.
It is debatable if this is actually a type of mutual masturbation. Frottage usually involves more intimacy that other types of masturbation. However, it is often categorized with masturbation, heavy petting, grinding genitals. Mutual masturbation can definitely and easily lead to frottage (if they are not already being used as synonyms).
Frottage can also be combined with intercrural intercourse, also known as interfemoral intercourse, which is the act of placing the penis between a partner's thighs. Another alternative is called a reach round, where two men stand in line front to back; and the man at the back reaches around to the front man in order to masturbate him. The man in back may rub his own erection into the vertical crease of the others buttocks at the same time.