You've probably heard the saying, "Motherhood is the most important job in the world." Heck, I've even said it. You've probably also heard, "Being a mom is the toughest job," or even, "A mom's job is a 24/7 job." Please understand that I in no way mean to devalue women or motherhood when I say that I think we should never call being a mom a job, because it's not one. In fact, it's totally more important than just a job.
It's funny, because no one ever refers to being a dad as a job. In our culture, dads are expected to work outside the home, and moms are expected to be moms and to work only if it doesn't interfere with that primary role. That's some seriously heteronormative, sexist, regressive bullsh*t, if you ask me.
Also, consider the fact that many moms already literally have freaking jobs. Is my value as a person solely determined by my ability to parent? Is a woman's career less important than her ability to be a mother? Will women ever gain workplace equality if they are expected to be mothers first and foremost, and ironically, experience workplace discrimination and fewer career advancement opportunities when they decide to have kids? Again, that's pretty much the definition of sexism and a serious double standard.
I've been a stay-at-home mom, a work-outside-the-home mom, a work-at-home mom, and a single mom who had to do it all, literally. Not one of these roles was harder or more valuable than the others, they were just different. I also don't believe that being a mom makes me more important or hardworking than my child-free friends.
Besides, if being a mom is a job then I want vacation days, weekends off, overtime, fewer biohazards and butt jokes, and a damn paycheck. In fact, I'd like to lodge a few complaints, too. Wait, do you man to tell me that there's no Human Resources department to report these things to? Dammit.