I see your point, though it does seem like these are both extensions of the same underlying instinctual desires present in males, mainly the need for dominance

I see your point, though it does seem like these are both extensions of the same underlying instinctual desires present in males, mainly the need for dominance (expressed in only a small percentage of the population for evolutionary reasons) and the need for sexual gratification / production of offspring. Being the biggest metaphorical genitalia around will lead to fulfillment of both of those things.