名词性交，交配，交尾
1. 交配：涡虫类虽为雌、雄同体,但仍需异体交配受精,其交配(copulation)常是相互的. 原始种类的交配常是皮下授孕,即用阴茎或交配刺插入对方皮下,将精子直接注入对方的实质中,精子随即迁到卵巢附近,而与卵受精. 但大多数较高等的种类,
2. (性交)：urethra (尿道) | copulation (性交) | cohabitation (同居)
3. 交尾：coprophilous 嗜粪的 | copulation 交尾 | copulatory pouch 交配囊
noun
1. the act of sexual procreation between a man and a woman
the man's penis is inserted into the woman's vagina and excited until orgasm and ejaculation occur
Synonym: sexual intercourse intercourse sex act coitus coition sexual congress congress sexual relation relation carnal knowledge