Some obvious objections:

• most adult males don't do this as a job;

• technically, it should be maximizing the number of offsprings, not the number of partners; also, maximizing the number of offsprings that reach reproduction age, not just the number that is born, or even conceived;

• if an adult male would literally try to "impregnate as many females as possible" (as opposed to merely professing trying to), he would have to become a serial rapist, a cult leader, a sperm donor -- probably all of that together -- but most adult males don't do that;

• is–ought distinction, evolutionary-cognitive boundary, et cetera.