A local university coach just retired after spending 37 years in athletics. He had 10 daughters and no sons. Can you imagine a household with 10 daughters? How many bathrooms would the house have to have, and how long would the lines be? We only had 2 daughters, and that was nutty enough, although I love them both dearly. The coach said he is retiring to spend time with grandchildren.
When my sons were teenagers, they spent as much time in the bathroom as my daughter did. I said than that every house ought to have one bathroom for every person.