Basically, this submarine officer, back from a cruise in the South Pacific during WWII, noticed that the pool of the Royal Hawaiian Hotel, the Pink Palace due to its color, was full of little girls. Submarine officers were allowed to bring their wives to Honolulu for morale purposes during that war, and between cruises they stayed at the Pink Palace.
Well, this officer wondered about that, why submariners had so many girl babies. He survived the war and went into academe; for his thesis he researched this. Ponder that if you will, ha ha.
What he was able to determine was that if man had fun with a woman, frequent fun, well, a LOT of fun, the issue was normally a darling baby girl. He followed up this old wives tale and determined the scientific reason, that being our little swimmers are divided into two groups, the XX and XY groups. The XX groups make a girl baby and the XY group makes a boy. We learned that a long time ago.
What we didn't learn, and this submariner professor found out, was that the XX group were pretty tough and hung around for a long time. The XY group were kind of weak and didn't last long, but damn were they fast! So infrequent fun favored boys, as if there was a egg to be found, they were going to get it. But men back from a cruise, well, the expected happened. That meant the the XX's were hanging around a lot, and the XY's were expiring. So you see a couple with a lot of girls, you have to smile, 'cause you know what is going on. I always look at the wife and think, yeah, there goes a real woman.
And we know all this because the Royal Hawaiian swimming pool was full of little girls. I like to have coffee there on Sunday mornings and I always think about that pool!
I found out googling how to make girl babies revealed world I had never suspected, evidently you can select the sex of you baby with pretty high precision.
And as night follows day, Alpha males, who tend to rise in business and politics, tend to have wives and mistresses and a lot of girls. To answer the question about high achievers and their girl offspring.
It would seem the more sex one had, the more little boys would be available and viable to conceive, and the more sporadic the sexual encounters, the more the little girls would be viable to conceive.