Matt Wallaert has drunk deeply of the liberal kool-aid. Here is his take on the issue of prostitution:
He is arguing this to be consistent with his liberal beliefs. Liberals generally believe in maximising individual autonomy. When applied to women, this means believing that a woman is only free when she is empowered to choose in any direction, without negative consequence or judgement. Matt Wallaert takes this idea to its absolute logical conclusion by claiming that he has no right to judge the (hypothetical) decision of his own wife to prostitute herself with other men.
It is one example of how the liberal formula can be degrading rather than liberating. Note as well just how incompatible the belief is with the idea of a spousal union and with the pursuit of a common good within family life. In this case, the wife can choose anything at all, no matter how damaging to the marriage, and the husband has no right to challenge or query the decision.
I would also point out that such a belief also undermines the possibility of effective male leadership. If you think the important thing is to be able to choose in any direction without negative judgement or consequence, then how can you put yourself forward to guide or to lead? If your best response is "it's up to her" no matter what she has chosen, how are you leading? Are you not vacating the field?