As a secondary involved with a couple who have a child, I would completely accept the concept of Veto Power for them if the stability of their family was at stake. The child and those who are responsible to provide a stable and healthy environment come first. Then again I believe marriages come first as well...I would just go into a relationship with my eyes open to the idea that my impact would be less than that of the married/established or parenting couple. In order to do that you have to "want" to be with the partner and not "need" to be with them in a specific way.
I'm weird..I know