I am not the lawyer poster, but there are a LOT of other options that allow sex twice per day. I am 50 and sometimes I have it on Saturday afternoon and then again in the evening. Sometimes twice in the evening, that happens a LOT if the kids are at their friends house or at a game, or just generally GONE. Sometimes I have it Sunday morning and then again Sunday night. Before kids, if I was not running in the morning we would have it twice on Saturday morning and twice that night after "date night" (dinner out and a movie at the theater). I will say that this was probably not her ideal, but she was coming 7 or 8 times per intercourse, so I felt it was fair for me to come twice.
This is go for 15 minutes vigorously and collapse, sweaty on top of each other sex. Then after 5 minutes, she can tell, and she says "Do you want to do it again?" Just like we are 19.
I do realize that this is not regular or everyone's experience. My friends when I was 40 said that once per week was "normal" and they had to make sure they took advantage on Saturday as every weeknight was a no-go. When I turned 50, they said once-a-month was more like it. These are smart, fit, organized people with wives who are the same, so I am not going to point fingers at women or men. I just wanted to refute the guy that said you could not possibly be having sex twice in one day unless the conditions he listed were in play.
For the unfortunate people who are not having sex but once per week or worse, they will find reasons that sex twice a day is impossible.