Translation guide
How to express the idea of sleeping together in Japanese, covering literal shared sleep, euphemisms for sex, and natural phrasing for different situations.
To say that people sleep in the same bed or room without sexual implication.
The most common and neutral way to say 'sleep together' in a literal sense. Can be used for family, friends, or couples.
子供の頃、よく弟と一緒に寝ていた。
When I was a child, I often slept together with my younger brother.
Specifies sharing the same bed, which can imply closeness but is still literal.
ホテルでは友達と同じベッドで寝た。
At the hotel, I slept in the same bed as my friend.
A formal or literary term for sleeping together in the same bed. Rare in everyday speech.
昔の旅館では見知らぬ人と同衾することもあった。
In old inns, people sometimes slept together with strangers.
To express 'sleep together' as a euphemism for sexual intercourse.
The verb 'neru' (to sleep) alone can be a euphemism for sex when context makes it clear. Often used with 'with someone'.
彼と寝たの？
Did you sleep with him?
Literally 'have a relationship', a common euphemism for having sex. Slightly more formal than 'neru'.
彼女とはまだ関係を持っていない。
I haven't slept with her yet.
Explicitly 'have a physical relationship'. More direct and less euphemistic, often used in serious discussions.
二人は肉体関係を持っていた。
The two were sleeping together.
Literally 'cross the line', a euphemism for having sex for the first time in a relationship.
ついに彼女と一線を越えた。
I finally slept with her.
To express 'sleep together' in very casual or slangy ways.
A very casual and somewhat crude verb meaning 'do it' or 'have sex'. Common among young people.
Can sound vulgar; avoid in polite conversation.
昨日、彼女とやった。
I slept with my girlfriend yesterday.
From the letter 'H' (ecchi), meaning 'have sex' or 'do naughty things'. Softer than 'yaru', used by all genders.
付き合って三ヶ月で初めてエッチした。
We slept together for the first time after dating for three months.
The phrase '一緒に寝る' (issho ni neru) is usually literal, but in a romantic context it can imply sex. If you want to avoid ambiguity, specify '同じ部屋で寝る' (sleep in the same room) or use other clarifications.
寝る (neru) is the most neutral euphemism. やる (yaru) is rough and masculine. エッチする (ecchi suru) is softer and common among younger people. Choose based on formality and relationship.