sex (a.k.a. soft swapping): Couples engaging in sexual activity in the same room but in separate pairs, without any swapping of partners or other major sexual activity between couples. Types of sex party A sex party is a gathering at which sexual activity takes place. Sex parties may be organized to enable people to engage in casual sexual activity or for swinging couples or people interested in group sex to meet, but any gathering where sexual activity is anticipated can be called a sex party. There are a number of types of sex parties: Swinger party/gathering A swinger party or partner-swapping party is a gathering at which individuals or couples in a committed relationship can engage in sexual activities with others as a recreational or social activity. Swinger parties may involve various group sex activities. Partners can engage in penetrative sex, known as "full swap", or choose to "soft swap" in which they engage only in non-penetrative sex. New swinging couples often choose a soft swap before they are comfortable with a full swap, although many couples stay soft swap for personal reasons. "Soft swinging" is when a couple engages in sexual activities with only each other while other couples perform sex acts in the immediate vicinity. Technically this is a form of exhibitionism rather than "group sex" per se. Orgy An orgy is a gathering where guests freely engage in open and unrestrained sexual activity or group sex; and a bunga bunga orgy is an orgy in which participants have sex underwater, such as in a swimming pool or a hot tub. Daisy chain A daisy chain refers to a sexual act involving three or more people, during which each person simultaneously has sex with the person beside them in the group, thus forming a chain. Some sources consider only groups of four or more people to be a daisy chain. Thus, in an "erotic foursome or partie-carrée, "two couples ... form a chain or Maltese cross carefully alternating man and woman". "The matter of ... erotic or spintrian chains ('daisy-chains')", i.e., "of 'spintries' or erotic human chains, ... has been taken to ... permutational development in the appendix of postures to the well-known Manual of Classical Erotology (1824) of the Fichtean philosopher, Friedrich Karl Forberg, and in a Swedish work, Ju fler vi är tillsammans ('The More the Merrier'), by a schoolteacher, Ragnar Aaslund, published in 1966 and