性行为
性行为，泛指生物之间涉及性个行为，可以是同性或异性之间个。
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人之间个性行为也拨叫做做爱。
個体
人或动物：
- 自慰
- 自我口交（autofellatio/autocunnilingus）
人同人
人同动物
- 人兽交（部份地方是弗合法个）
动物同动物
- 交配
- 配种，打种
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