casual sex

Noun

uncountable

Sexual activity that is undertaken without commitment, emotional attachment or personal familiarity between the participants involved.

Japanese Meaning

拘束や感情的な結び付けがなく、個人的な親密さを伴わない、一時的・非公式な性行為

After several awkward dates, they decided to have casual sex without expectations or emotional attachment.

ぎこちないデートを何度か重ねた後、二人は約束や期待、感情的な結びつきのない性的関係を持つことに合意した。

Sense（1）

Sexual activity that is undertaken without commitment, emotional attachment or personal familiarity between the participants involved.

She was after more than casual sex; she was looking for a long-term relationship.