Clearly they had one day a year scheduled for sex

I find that interesting, in my family unit of my 2 parents, 4 siblings and our 5 partners, we don’t even have 2 birthdays in the same month - which just makes it sound even more counter-intuitive to me, not that I’m disbelieving it, just relating it to my personal experience. . Once we go to the next generation, with my children, nieces and nephews, that adds another 12 people and the closest we got was 3 days apart.