
If we get rid of adultery as part of the redifinition of marriage then of course politicians like John Major, David Mellor, Nicholas Soames, Chris Huhne, Robin Cook, Tim Yeo, Geoffrey Archer would have had no reason to be embarassed.
Another effect is that when a Catholic headteacher runs of with the caretaker, leaving spouse and children, it is going to be difficult to demand their resignation or just to sack them. At the moment Catholic teachers and other employees have a morality clause in their contract ensuring that they are in fact Catholic.
Recently the CES and Bishop's Conference issued Christ at the Centre: Why the Church Provides Catholic Schools, a defense of Catholic schools and also a setting forth of guidelines, whether these will be enforceable if marriage is redefined will be another matter.