英 [seks ækt] 美 [seks ækt]
性行为：指两个或多个人之间进行的性接触或性刺激活动。
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
同义词： sexual intercourse / intercourse / copulation / coitus / coition / sexual congress / congress / sexual relation / relation / carnal knowledge
性交行为
Today, turtles often begin the sex act in open waters, sinking during copulation.
And the force used must be in addition to that which is used to commit the sex act.
FORBES: An Invitation for Elizabeth Warren: Talk About Defective Rape Laws
Paterson was convicted of performing a sex act on one of the young men and sexually assaulting both of them.