To them sex outside of marriage is dirty, unless you repent according to their particular take on Jesus.
Why touching your sisters in a sexual way is forgivable, but engaging in an extramarital affair isn't is a near mystery. Apparently only Democrats are not forgiven, but adulterers like Sanford, Craig, Gingrich and Guiliani are allowed to get forgiveness from their sins from Jesus. I can understand forgiveness and repenting if it were equally allowed no matter what the political party, but they have this thinking that they have a private line to Jesus that let's them know what He thinks.
Forgive them Father, for they know not what they do.