Wondering what kind of father you’ll be? According to a new study, the answer may be in your spit. A team of French and British researchers analyzed the testosterone levels in the saliva of Senegalese villagers, and found that those men with higher levels of the hormone were more likely to cheat of their wives and be involved in marital conflict. A comparison of testosterone levels of polygamous dads, monogamous fathers and unmarried men revealed that those with children had lower levels of the sex hormone than their single counterparts. But those men with multiple wives had higher levels of testosterone than those with only one wife.