(1) A legal transaction that offends common decency is void.
(2) In particular, a legal transaction is void by which a person, by exploiting the predicament, inexperience, lack of sound judgment or considerable weakness of will of another, causes a promise to be made to them or to a third party, in exchange for an act of performance, for pecuniary advantages that are clearly disproportionate to the performance, or causes such pecuniary advantages to be granted.