Yup. But look at it the other way around. For a married parent to have taken up adventuring, there must have been a powerful motive of some kind. That's a plot hook for the DM to leverage !
Of course it can happen, i am not denying that. Its just that if the guy/gal is an adventurer, he might not stick around as much as the other one would like, be it by actually just succeeding and being away months on end, or because of the fear of him actually dying. Some people cant handle the loneliness or the fear for your loved one.