Definition
To engage in sexual intercourse with someone.
與（某人）發生性關係；和（某人）上床
They went to bed with each other after their first date.
他們在第一次約會後就發生了關係。
She regretted going to bed with someone she had just met.
她後悔與剛認識的人發生了關係。
After dating for a while, they decided to go to bed with each other.
交往一段時間後，他們決定發生關係。