A gangbang is a sexual activity where a woman willingly participates in sexual acts with multiple men simultaneously. It typically involves one woman and three or more men, although the exact number can vary. The participants may engage in various sexual activities, such as oral sex, vaginal penetration, and anal sex. The term "GB" is often used as an abbreviation for gangbang in online discussions or adult content. It is important to note that participation in a gangbang is consensual and occurs between consenting adults.