Mmmm... I don't care if the gal intentional or unintentional 賣淫 or not. Think of the following;
1. you give her gift and get to bed afterwards;
2. she just takes your gifts and no SXX afterwards;
which gal worths your love?
If an actress goes out with a rich businessman, it is hard to believe if it is purely based on LOVE.... She doesn't have sex with him until he gives him some gifts.... Is it prostitution?
In my view, this is not considered as prostitution. Because she has become your wife already. And there's feeling in it. Whereas prostitution is a transaction with no feelings.