Monogamy should actually decrease sexual scarcity. There are a lot of sexual topologies out there, but let's compare two historically common ones: monogamy and

Monogamy should actually decrease sexual scarcity. There are a lot of sexual topologies out there, but let's compare two historically common ones: monogamy and polygamy. Boys and girls are born in equal proportion, and monogamy pairs them up. If nobody died before old age and everyone were adequately paired up, monogamy would mean that every couple that wants sex could have it, a certain shade of zero scarcity. Historically, polygamy meant that attractive or powerful men could have multiple wives. So again, given our sexes' equal birth rates and assuming nobody died before old age, a polygamous society must leave some men without a committed partner for sex.