Sexual reproduction? Women are able to do things for themselves, are you telling me they get nothing out of being a mother? An activity that is difficult can exist without being called a job.

Someone better inform the rest of the 120 60 billion mammals on the planet they better clock on and pick up their paycheck for their 9-5 jobs.

Also, giving birth isn't a re-ocurring activity one performs for their livelihood, it's an event that someone goes through to achieve something, during a certain period of time under a week (ideally less than a day, but humans be bodying).