性行為
性行為，泛指生物之間涉及性嘅行為，同性或異性之間嘅都計。
可以繁殖到後代嘅性行為，叫「性交」、「交配」……
個體
人或動物：
- 自慰
- 自我口交
人同人
人同動物
動物同動物
- 交配
- 配種，打種
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