'Sexual Relations' in the Bible

and a man has sexual relations with her without her husband knowing it, and it is hidden that she has defiled herself, since there was no witness against her, nor was she caught --

Then the priest will put the woman under oath and say to the her, "If no other man has had sexual relations with you, and if you have not gone astray and become defiled while under your husband's authority, may you be free from this bitter water that brings a curse.

But if you have gone astray while under your husband's authority, and if you have defiled yourself and some man other than your husband has had sexual relations with you."