Heat Cycle

Heat Cycle 

Refers to a phenomenon in which a character undergoes an estrus-like mating cycle in which they experience heightened sexual drive and the strong desire to mate or reproduce offspring. This is a common kink in certain tropes such as Omega-verse fics or among more animalistic characters. Heat cycles may include dub-con situations if the heat becomes overwhelming, self-lubrication to ease resulting penetration, and increased fertility (even in males, which may lead to Mpreg).