口交的英文：
oral sex

参考例句：

Don't brush your teeth or floss immediately before you are likely to have unprotected oral sex.
口交前避免刷牙或使用牙线。

SAFER ━ Oral sex using a condom
较安全－有防护措施之口交

Oral sex can give either type the chance to infect the usual site of the other.
口交会使这两种类型有机会感染他人常用的部位。

MOST RISKY ━ Performing oral sex on a man or a woman unprotected, ejaculating in your mouth is most risky
高风险－不论男女之无防护措施、并在口腔内射精的口交

SAFEST ━ Avoid oral sex (licking the shaft and testicles, instead of having the head of the penis in the mouth)
最安全－避免口交(舔舐阴茎和睾丸以代替口含龟头)

LESS RISKY ━ Oral sex unprotected, without your partner ejaculating in your mouth (HIV virus is also found in pre-cum)
危险性较小情形-无保护口交行为，性伴侣未在口中射精（HIV病毒亦见于患者的精前液

oral是什么意思：
adj. 口头的，口述的；口服的
n. 口试

He failed the oral.
他口试不及格。

The candidate will take an oral examination.
那个应试者将参加口试。

an infection of the oral pharynx and tonsils by streptococcus.
由于链球菌所导致的喉咙扁桃体感染。

Fluency in oral and written English is a major requirement.
英语口、笔头流利是主要条件。

EL usually stands for elevated railway in oral English.
EL在口语中通常代表高价铁道。

sex是什么意思：
n. 性别；性；性行为

There are members of both sexes in the committee.
委员会里男女委员都有。

You know the risks of promiscuous sex.
你知道滥交的危险。

The sex discrimination act defined two kinds of sex discrimination... Direct and indirect.
《反性别歧视法》阐释了直接歧视和接歧视。

There's too much sex in the film.
这电影里色情场面太多。

It's difficult to sex newborn chicks.
新生小鸡雏的性别是很难判断的。