do the deed

Verb

Meaning

(euphemistic) To have sex.

Used other than figuratively or idiomatically: to do a given deed.

Source: en.wiktionary.org

O for ten years, that I may overwhelm / Myself in poesy; so I may do the deed / That my own soul has to itself decreed. John Keats

Entreaty and right do the deed. Spanish Proverb