他是我的长期性伴侣。

He is my long-term sexual partner.

她和她的性伴侣一起旅行。

She travels with her sexual partner.

他从未有过固定的性伴侣。

He has never had a steady sexual partner.

他们决定成为彼此的性伴侣。

They decided to be each other's sexual partner.

你应该和你的性伴侣讨论安全措施。

You should discuss safety measures with your sexual partner.

尤其是和你在一起很久的性伴侣。

Especially with someone you've been doing it with for a very long time.

不要低估性爱的力量，甚至是和你在一起很久的性伴侣。

Don't underestimate the power of sex, even with someone you've been doing it with for a very long time.

有些人的性伴侣是和自己相同的种族，有些是不同种族。

Some of those people are with partners of the same race; some of them are with partners of a different race.

有些人和性伴侣之间相识已久，有些则是从网上联系到的一夜情。

Some of them have known each other a long time; some of them met last night on the Internet.