And what happens when things align such that sexual incentives occur which are contrary to relevant covenants? If we can't trust a politician to be loyal to his wife when faced with another attractive woman, why should we trust him to be loyal to political or employment covenants, by all accounts much less intimate and involved than a marriage covenant, if such a condition was presented?

For instance, if a company promises lots of pre-paid escort time in exchange for a given change to a given bill, why should we expect that an adulterer would be any more loyal to the right regarding the political establishment than his own wife and family?

And the reality is that these people don't even need an explicit sexual offer to betray their associates, there are many other bribes that appeal to the same basic desires (like money, power, status, etc.) that can be exploited to the same ultimate end.

An adulterer is a proven liability. Why should we trust him and invest a bunch of time and money and trust and secrets into him, only to betrayed when an adversarial entity lures him with money and sex? Obviously repentant people should be given another chance at some point, but I would never trust a known adulterer that wasn't completely repentant.