You won’t be able to afford both and arguments will ensue. This isn’t even taking into consideration the children you may end up having in your 20s. Kids are very, very expensive. Any idea how much diapers cost? You’d think that getting married and having two incomes would make things easier, and it may for a while. But with marriage comes stress and without some extra cash to throw into the face of stress, your marriage is likely to blow up in your face.