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#Being in Heat

This visual novel contains characters that can go into heat. Being "in heat", also known as the [url=http://en.wikipedia.org/wiki/Estrous_cycle]Estrus cycle[/url], is the period of maximum sexual receptivity that the female of most mammals, excluding humans, experience just prior to ovulation. In species/monsters with estrous cycles, females are generally only sexually active during the estrus phase of their cycle.

8 VNs carry this tag.