Of course it matters if people are cheating on their wives or partners, and it is a great wrong, and, in the terms used, a sin. But it is not a political matter and should not be a public matter. What people do in the privacy of their bedrooms is up to them, unless they are doing it with people who are under age, or exploiting people in some significant way. The only public interest is when that same politician has been preaching 'family values' as a political message- hypocrisy is deeply unpleasant, and needs to be exposed, especially when it is about sexual matters and the politicians concerned have rejoiced in being purer than pure.

One last point. Sexual morality matters- of course it does. But it is largely about trust. What matters far more in moral terms is how we treat those who are vulnerable or disadvantaged- and the sex scandals carry a far greater presence than they should, compared with politicians' lack of action to help those who are truly vulnerable, or their actions that actually make vulnerable people's lives still worse. We need to get a sense of proportion here- sex is not the only sin. But hurting, cheating, and exploiting people is pretty bad news in any of our religions' books.