What would a man/female focused solely on their biological fitness do in the modern world? In animals, males would procreate with as many females, as they could, with the best scenario where they have different males raise their offsprings. Today, we have morning-after pills, and abortions, it is no longer enough for Pan to pinky-swear he would stay around. How does he alter his strategy? One I can quickly think of is sperm donation, but would that be his optimal strategy? I am certain that the hypothetical sultan from the old days could possibly produce more children, but how do their relative fitnesses compare, taking into account that in the western world, most places' population growths decreased in intensity, or plateaued, or are even falling.

For females, egg donation seems like it should beat older methods hands down.

Would these really be the optimal strategies? In most cases, successful reproduction requires that both sides desire to do so. I am not sure that the level of attractiveness exists at which one could simply put on offer their genes, without a bank as an intermediate. On the other hand, I have heard tales of same-sex couples organizing such endeavors.