One is more scalable, doesn't normally imply adultery (and breaking marriages), and doesn't spread STDs to otherwise well meaning gentlemen, so arguably offers

One is more scalable, doesn't normally imply adultery (and breaking marriages), and doesn't spread STDs to otherwise well meaning gentlemen, so arguably offers more benefit per unit of labor employed and is less socially disruptive. As far as contradictions go this one is more practical than incomprehensible.