Is it common practice for a sitting U.S. President to cheat on his spouse?

All of us are familiar with the situation with ex-president Bill Clinton. One has to wonder, is this a common practice with sitting U.S. presidents? Do most sitting presidents cheat on their wives? If so, are there documented cases of this “high-profile” cheating? A site that gives in-depth study and information? Just about eveything else is on the web, so where can i locate this information? Question: Does cheating occur with sitting presidents or do most stay true to their spouse?