to have sex with someone; to sleep with someone
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?