“Have sex” is the neutral way to describe sexual activity between consenting adults. See grammar patterns, collocations, prepositions, comparisons, examples, and consent-centered, safer-sex guidance.
In British English, “have it off (with someone)” is a cheeky euphemism for having sex. See grammar, collocations, prepositions, comparisons with similar idioms, examples, and respectful alternatives.
In BrE, have it away chiefly means “have sex.” Older slang also uses it for “run off” or “steal and escape” (e.g., “on one’s toes”). Learn grammar, collocations, prepositions, comparisons, and examples.
“Have intercourse” is the formal phrase for having sexual intercourse. Learn its tone, grammar, prepositions, collocations, comparisons with related terms, examples, and notes on consent and safety.
“Have a go at it” means “try it,” while “have a go at someone” means criticize them. Learn grammar, collocations, prepositions, British/US equivalents, examples, and the difference from “go at it.”
“Get laid” is informal slang for having sex, often with a boastful or casual tone. See grammar, collocations, preposition patterns, examples, comparisons, and neutral alternatives centered on consent.
“Get it on” can mean start something with energy, hype a fight, or (as a euphemism) have sex. See grammar, collocations, prepositions, examples, and clear, respectful alternatives.
“Eff” is a euphemistic stand-in for the F-word. People say eff off, eff up, effing cold, etc. It’s milder than full profanity but still informal and rude. Learn usage, collocations, and clear alternatives.
“Do it” usually means complete the task; in euphemistic contexts it can mean have sex. Learn grammar, collocations, preposition patterns, idioms, examples, synonyms, antonyms, and clear, respectful alternatives.
“Bonk” can mean a light hit, an endurance-sport energy crash, or (UK slang) to have sex. Learn pronunciation, grammar, collocations, prepositions, idioms, examples, and respectful alternatives.