性—个人性的决定因素
Sex - Factors in Determining a Person's Sex

4. 内部性器官   Internal accessory reproductive structures

正常时   Typical:
女性有卵巢、子宫、阴道等等。
男性有输精管道、精囊腺和睾丸等等。

The female body has oviducts, a uterus, a vagina etc.
The male body has sperm ducts, seminal vesicles, a prostate etc.

异常时   Atypical:
在罕见的案例里，上述的器官要么发育不良，要么就缺乏。

In rare cases, these organs are underdeveloped or missing.