But how do you tell when the time is right?
Recent studies have already shown that women are more likely to stray during their fertile period each month—the 48 hours or so of ovulation. They're also more likely to be attracted to macho-type guys (dominant "alpha" males) during that same couple of days.
Now it turns out, according to yet another new study, that men tend to be more jealous when their wives or girlfriends are close to ovulation. They also become more aware of other men with strongly masculine facial features, someone who appears "as though they could get what they wanted."
This may be because those masculine features are linked to high testosterone levels, demonstrating good genes that can be passed on. According to the lead author of the study, "Men become more wary of masculine-looking men only when the female's facial preferences begin to shift prior to ovulation. Face shape and structure are good indicators of dominance.
"Men with large eyes, rounded chin, and full lips are viewed as more feminine and are chosen as long-term partners. They are not, however, seen as dominant. During the female's most fertile phase, she tends to prefer faces that indicate high testosterone levels, which indicate good genes."
But how does a guy know when his woman is ovulating, if she doesn't tell him?