4 out of 5 men have a cheating gene
check out SAT scores. high scores = intelligence = monogamy
low scores = dumb = cheating
how he behaves at work. does he badger the employees? tries to get out of tickets?
middle aged more likely to cheat
if he cheats once, he will, again
if he wasn't committed to first wife, he won't be to second one
adventurous men tend to crave risky circumstances