上床的

to have sex with someone; to sleep with someone

→ 上床
phrase Rare #25,233
to have sex with someone; to sleep with someone Here 上床 is a euphemism for having sex. Sentence-final 的 can emphasize or package the event as the focus of a question or statement; it does not mean “of.”
CH: 你从什么时候开始和他上床的?
EN: When did you start sleeping with him?

你从什么时候起和他上床的?

When did you start sleeping with him?

— 阿黛尔的生活 (2013)

总有一天马嘉丽会和我上床的

One day, Ma Jiali will sleep with me.

— 触不可及 (2011)

杉村没兴趣和女孩子上床的和弘树有什么关系?

What does Sugimura not being interested in sleeping with girls have to do with Hiroki?

— 大逃杀 (2000)

他俩没可能上床的

There’s no way those two would sleep together.

— 朱诺 (2007)

我不是傻子你从什么时候起和他上床的?

I'm not stupid. Since when have you been sleeping with him?

— 阿黛尔的生活 (2013)