When a man fucks a woman, he becomes slightly more Dom, and she slightly more Sub.
Doms are hypermales, who are stronger, bigger, tougher, and even smarter than normal men, and who look like it too. Subs are hyperfemales, who express enhanced stereotypical female forms and behavior, looking and acting like a wet dream come to life. They release pheromones that can affect normal men and women, making them either more sexually assertive, or aroused and gullible, respectively. If either a man or a woman are exposed to the pheromones for too long, they slowly start to become Subs, even if they are not sexually active. This is slowed and then reversed in men if they get laid a few times by a woman or Sub, but if a Dom fucks a man or woman it speeds it up. Men who turn into Subs become traps that can pass perfectly. If a woman, or a Sub, is around a lot of Subs with no Dom, they become Doms themselves, turning into a futa. You can turn back to normal by abstaining for a few months, Doms turning back into men, and Subs turning back into women, regardless of how they started out.
Most people are Subs, being part of, or traded between, a harem controlled by a Dom. Many people are still normal men and women, avoiding too much sexual activity, or contact with the Dom-Sub community, to avoid changing. This can be tough, since getting a whiff of pheromones, or seeing the kind of perfected body you might attain, changes peoples minds quickly. And the rest are Doms, who spend their free time keeping their harems loyal, poaching other Subs, or turning normal women, and sometimes men.
