Flat out exhaustion.
Once you become a parent, “naps vs. sex” is a real choice you have to make, assuming you have time for either one.
And frankly, you usually need the nap more.
Kids aren’t too coordinated, so if you’re not watching them every minute, sometimes they fall off stuff.
Or eat the dog’s food. Whatever, it, uh, happened to a friend of mine.
Sadly, it seems the occasional sex fail is just part of being a parent. Care to share your TMI storys?