Among all these calculations of the cost of a prostitute vs. a wife, the tips for the most efficient use of time and the wallet of loved ones, I all remember the old quote of a guy who admired a sleeping girl who reminded him of a fairy with its fragility. And he was in her before that shit.
I hope that love, cohabitation and marriage are all about spiritual merger, not complementarity. Because when there is the first, the second everyone tries to provide. For the other and for the common.