群交
群交（長稱：群體性交）即係多於兩人嘅性交。因為進行群交嘅人有多啲性伴侶，所以傳染性接觸傳染疾病嘅風險特別高。名詞3P、4P、5P……個數目指明參與者有幾多。
- Gershon Legman (1969). Oragenitalism : Oral Techniques in Genital Excitation. New York: The Julian Press Inc.
- Burgo Partridge (1960). A History of Orgies.
- Gay Talese (1980). Thy Neighbor's Wife.
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