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The r/K selection theory has been around since the '60's.  It relates to the selection of combinations of traits in an organism that trade off between quantity and quality of offspring.

K-selected species display traits associated with living at densities close to carrying capacity, and typically are strong competitors in such crowded niches that invest more heavily in fewer offspring, each of which has a relatively high probability of surviving to adulthood.

In stable or predictable environments, K-selection predominates as the ability to compete successfully.  Limited resources are crucial and populations of K-selected organisms typically are very constant in number and close to the maximum that the environment can bear.

K-select characteristics can include large body size, long life expectancy, and fewer offspring, which often require extensive parental care before they mature.

K-select=King Kong

By comparison, r-selected species are those that place an emphasis on a high growth rate and typically exploit less-crowded ecological niches, and produce many offspring, each of which has a relatively low probability of surviving to adulthood.

In unstable or unpredictable environments, r-selection predominates as the ability to reproduce quickly is crucial. There is little advantage in adaptations that permit successful competition with other organisms, because the environment is likely to change again. Among the traits that are thought to characterize r-selection are small body size, early maturity onset, short generation time, and the ability to disperse offspring widely.

r select=rabbits

Rabbits could be considered the epitome of r-selection.  They eat grass, a never ending food supplied by nature.  Rabbits excel at eating, reproduction in large numbers shortly after birth, and laying waste to gardens.  Baby rabbits are born and left to fend for themselves with no parental nurturing.  Rabbits aren't very bright and could be considered the dumbest animals on the planet.  Without predators to keep their numbers down, rabbits can easily over-populate an area, eat everything in sight, and die off when the food supply is exhausted.  Rabbits can not exhibit any loyalty or emotional attachment to peers or anything else. 

Wolves can be considered K-select.  Their food supply is less abundant, which stimulates competition and tends to embrace monogamy, and favor high-investment, two-parent parenting, with an emphasis upon rearing as successful an offspring as possible, giving them the tools to acquire resources themselves, and reproduce successfully.  Wolves form competitive groups and develop strategies to acquire resources.  For these reasons, wolves are usually more evolutionarily advanced than their r-selected counterparts, and will exhibit more complex adaptations, from increased intelligence and sentience, to increased physical capabilities, to loyalty and social hierarchy.        

Yeah, sounds like some boring biology shit, but when you plug humans into this equation it brings it all a little closer to home.

There was a time in America when K-select humans were the norm.  They worked, got married, bought a home, raised kids, sent them to school, helped them with their homework to get good grades to get a better job so that they could live the American dream.  Free market economy ruled and everyone got excited when the new cars came out in September.

The tide has shifted and r-select humans are the new norm.  Single girls are now single moms.  Dad has been replaced by the government with an endless supply of food, clothing, and shelter.  Each offspring brings in more resources from Uncle Sam who sends the checks by mail.  An endless food supply, no competition, and free sex with no responsibilities.  Why work when you can get it for free, right?

This also creates a very fundamental difference between the mating preferences of r-select and K-select females.  Where K-select females tend to be more cautious in selecting a mate, one who will stick around and nurture and support them and their offspring with a big house, bank account, and offshore accounts that successful K-select males tend to acquire, r-select females become sexually active at a much earlier age and are geared more for breeding without the burden of the guy sticking around afterword.  They already have a sugar daddy... Uncle Sam, and his pockets are deep and he sends the check on time every month. 

Just because an r-select human female will have sex with just about anyone doesn't mean she'll have sex with you, unless you're r-select as well.
This is the fundamental difference between r-select and K-select humans.  r-select females breed only with their own kind, regardless of race, age, or national origin.  It's the core ideology at the genetic level that takes preference over everything else.

But there's hope for all you K-select guys out there that want some hot action from a nubile, young, r-select female in her sexual prime.  Use some of those K-select talents you were born with like subterfuge, stealth, and cunning.  Tell her how great Obama is and how you wish he could run for a third term so he can get us more money and how the rich have too much and how their money should go to the people who really need it.  Praise Hillary for being the first woman president and that you voted for Obama six times in the last election and you will do it again.  Have a discussion about climate change and how using less toilet paper will save the rain forest.  Talk about how we need more gun control and the constitution was written by old, rich, slave owning men a long time ago and it's time we change it.  Let her know if they raise the minimum wage to 20 bucks an hour you might get a job, if you can keep your EBT card.

Ya know... pretend you're a liberal.