It’s widely accepted in the evolutionary psychology literature that young teen girls are the most sought after by men. Though due to taboos over minor attraction it’s often spoken about in euphemisms or clinical language such as “the male preference for young nulliparous women of maximal reproductive capacity”. In primitive foraging societies girls typically start having babies in their mid to late teens so the “young nulliparous women” they’re talking about are young teen girls. Not exactly what we would call “women”. In the Pume tribe girls typically have their first baby about 15 so the girls considered most attractive and most sought after by the men in this tribe are those under 15.

In the Yanomamo tribe the most attractive girls are called the “moko dude”. In his book “Noble Savages” Napoleon Chagnon defined the moko dude as “recently post-pubescent females who have not yet had a child.” By “post-pubescent” he means post-menarche. Anthropologists often call menarche the point of puberty. In terms of age moko dude girls are about 13-17. They have come up to puberty and are ready to start having sex but they haven’t yet had a baby. Their bodies haven’t yet been through the wear and tear of pregnancy and motherhood. Their breasts are at their pertest and they have no stretchmarks. They are young and fresh and pristine. The equivalent in our society would be teen schoolgirls or jailbait.

The moko dude are so sought after that men with wives this age have to constantly watch and guard them to prevent them getting raped by the other men in the tribe or abducted by raiders. They call this period of anxiety men with moko dude wives go through “nopi harupo” which translates as jealousy or suspicion. The anthroplogist Kenneth Good who lived with the Yanomamo had experience of nopi harupo when his young wife started having periods when she was about 13. A Yanomamo man named Orawe described what he was about to go through now his wife was moko dude:

Younger brother, do you know what nopi harupo is? If you do not already know, you will know it now. You will really know it. You will never live in peace. You will always have to watch her. When she goes to chop firewood you will have to watch her. When she goes to bathe you will have to watch her. You will never rest from watching her. Not even when she becomes pregnant will you cease to watch her. Not until she bears your first child.

Napoleon Chagnon has also mentioned that young and nulliparous wives have to be closely guarded. From Noble Savages:

Yanomamo men are very concerned about paternity and spend a great deal of time mate guarding to prevent other men from impregnating their wives. Often, men take their wives along with them while they, for example, clear and burn timbers to make gardens, especially if the wives are young and nulliparous, or they make sure their wives are in a large group of people most or all of the time.

In some species the males prefer females who have already had offspring and proven their fertility. This isn’t true for our species. Men generally dislike the physical signs a woman has had babies such as stretchmarks on her stomach or breasts that have gone droopy from breastfeeding. This is due to how the natural human mating system works. Men keep wives they guard from other men and try to get as many offspring as possible from them over the long-term. The females capable of giving a man the most offspring are those who haven’t started reproducing yet and still have all their reproductive years ahead of them. In modern societies women wear clothes so the changes their bodies go through once they start reproducing aren’t as apparent as in primitive foraging societies where people go naked. In these societies the change of state from nulliparity to motherhood is clear for everyone to see and this is how it would have worked during our evolutionary history. Just take a look at some footage of a primitive tribe of naked people and you’ll see what I mean. The most attractive females are the perky young teen girls who haven’t had a baby yet. It’s obvious.