no strings attached

with no strings attached (if something has no strings attached, there are no obligations or requirements involved; with no obligations attached) — без каких-л. условий или обязательств (часто денежных); ни к чему не обязывающий (об отношениях)

Example 1: I was given the car to use with no strings attached. (IdiomConnection)

Example 2: He insists: This is strictly personal nothing to do with business; no strings attached!

Example 3: He said he was all for a good simple sex-based relationship — with no strings attached. — Он сказал, что ему нужны были простые, ни к чему не обязывающие отношения, основанные на сексе.

Example 4: The problem up to now has been that any guarantees that the government has offered to banks have come with major strings and exorbitant fees attached (bbc.co.uk). (пример того, как данная единица может изменяться в контексте. — Сonsuello)