copulation

基本解释

And every garment， and every skin， whereon is the seed of copulation， shall be washed with water， and be unclean until the even.
无论是衣服是皮子，被精所染，必不洁净到晚上，并要用水洗。
For example, a male is able to identify a female in estrus by compounds (pherimones) present in her urine and copulation will only be attempted during this time.
例如，一头公狼能够通过与一头发情期的母狼的尿液混合物辨别母狼，也只有在发情期才会与母狼交配。
And if any man's seed of copulation go out from him， then he shall wash all his flesh in water， and be unclean until the even.
人若梦遗，他必不洁净到晚上，并要用水洗全身。

Today, turtles often begin the sex act in open waters, sinking during copulation.
MSN: Fossilized turtles' sex act frozen in time - Technology & science - Science - LiveScience NBC News