Hilchos Issurei Mizbeiach 4:12

If the prostitute of the previous halacha took the item she was given and consecrated it for an offering before having relations with the man, but they had relations before the item was actually offered, there is doubt whether or not it is prohibited as the wages of prostitution. On the one hand, they had relations before it was offered, but on the other hand, it was consecrated beforehand. In such a case, it should not be offered, but if it is offered, it is accepted.

Hilchos Issurei Mizbeiach 4:13

Let’s say that a man had relations with a woman but he didn’t give her anything. If he later gives her something – even many years later – it is prohibited as the wages of prostitution. This is the case (a) when he asks a non-Jewish woman to be intimate with him in exchange for a sheep, because she doesn’t have to bring it into her domain in order to acquire it, and (b) when the sheep was left in a Jewish woman’s courtyard and he told her that if he fails to pay her by date X, then the sheep is her. However, if he said, “Have relations with me in exchange for this sheep” without further detail and he was then intimate with her and later sent her the sheep, it may be offered and is not considered the wages of prostitution (but rather the payment of a debt).