relating to the activity of sex

Most people remember their first sexual experience. 大多数人都记得他们的第一次性经历。

a sexual relationship 性关系

sexual assault/harassment 性侵犯／性骚扰

formal sexual intercourse (= the act of having sex) 性交

sexual orientation (= the fact of someone being sexually attracted to people of a particular gender, or more than one gender)

relating to the production of young living things by the combining of a cell from a male with a cell from a female

sexual reproduction 有性繁殖

relating to a person's physical state of being male, female, or intersex

Sexual equality will not be achieved until there is more provision for childcare. 只有提供更多的幼儿保育服务，才会实现男女平等。

Some steps have been taken towards ending sexual discrimination (= treating people unfairly because of which sex they are). 已经采取了一些措施来消除性别歧视。