What is the theme in The Twelve Caesars by Suetonius?

Infidelity is a theme in ths book. In modern day politics, fidelity is considered a very important attribute. When members of the congress, senators, or even the president is caught in an adulterous act, or rumors surface about such acts, the people react in a very negative way. In Rome, during the lives of the twelve Caesars, things are quite different. Fidelity is a respectable thing, but it is not common or necessary. All of the Caesars are involved in homosexual, heterosexual, or even both types of extramarital relationships and it does not really seem to bother the people.