[jameshush]

My wife teaches Chinese, and this is spot on our situation. Schools and language centers are always hiring. She usually has 1-2 private online students she tutors (generally adults who are learning Chinese for fun). As long as she commits to a semester at a time and doesn't leave in the middle of her semester, she can always return to her job. If we have kids, she can go part-time or be a full-time mom for a few years. Every school teaches the same stuff, so it's not like she has to "keep up" like I do as an engineer and learn new things every few years.

Her income is a lot less than mine, but the extra cash is nice. We've set up our life so we don't NEED the money she brings in so if it ever goes away we'll never panic.