Threesome: is the term which describes a sexual act involving three people, sometimes also referred to as a menage a trois.

The act has been referred to by some as being done by married couples who have reached a point in their marriage where both believe they need added excitement, commonly referred to as spicing up the marriage. In most cases it is a one time act by a married couple with a third partner, and not intended to be carried on further, sometimes called swinging. Thressomes tend to be with 2 females and a male.

Voyeur: Voyeurism is a practice in which an individual derives sexual pleasure from observing other people. Such people may be engaged in sexual acts or be nude. At swingers parties or swinger events voyeurs tend to enjoy watching others engage in sexual acts.

Group Sex: An all-inclusive term for activities involving multiple partners in the same vicinity.

Typically, swinging activities occur when a married or otherwise committed couple engages in sexual activity with another couple, multiple couples, or a single individual. These acts can occur in the same room (often called same room swinging) though different or separate room swinging does occur. On these occasions, swingers will often refer to sex as play. Group sex is sexual behaviour involving more than two participants at the same time. Group sex involving one participant being penetrated by multiple people is sometimes termed a gang bang.

A menage a trois is the French term describing a relationship or domestic arrangement in which three people, often a married couple and another lover, share a sexual relationship, although the relationship might or might not involve all three persons having sexual relations with each other. It is also used to refer to an arrangement where three people share sexual relations, and this has become the predominant definition. Some also use it to describe any sex act involving three people, otherwise known as a threesome. Menage a trois, especially two women with one man, has become more common, perhaps due to the increasing exposure of swingers and swinger events.

A gang bang (or a gangbang) is a situation in which one individual, either a woman or a man, has sexual intercourse with multiple partners in turn. When a man has sex with several women, it is usually known as a reverse gangbang Gang bangs are usualyl attended by many people where some may choose to participate while others enjoy simply watching and being voyeurs.

Exhibitionism: having sex with a partner while being watched. Exhibitionists who view exhibitionism as a lifestyle as opposed to a rare thrill carefully select their target audience and make the exposure brief, inconspicuous and apparently unintentional. It is a fetish, and many such practitioners see it as an art form. Some exhibitionists wish to display themselves sexually to other people singly or in groups. This can be done consensually as part of swinging or group sex. When done nonthreateningly, the intent is usually to surprise and/or sexually arouse the viewer, giving the exhibitionist an ego rush.