Reading from Does increased calorie intake cause increase in libido in humans?, @AlexStone says:
I'm aware that humans have a dual mating strategy - somewhere between pair bond and casual mating. There are a number of physical measures to indicate this - such as sexual dimorphism between male and female, sperm counts and tested size, as well as age of puberty of females.
How does the age of puberty of females can inform us on the mating strategy?
Why does the observed age of puberty of females suggests a "dual mating strategy"?