In any ecosystem, there are factors to control populations. In a stream, the predators of a certain organism will help keep populations checked. Moreover, the limited resources, such as space and food, will keep the population from growing out of control.
The American biologist, Dr. Alfred Kinsey had incorporated in the Institute for Sex Research. He worked on a series of sexuality studies during the 1940s in Indianan university.
Dr. Alfred Kinsey explained that the sexuality exists on a continuum. The person's sexual orientation generally based on the experience and response at that time.
Thus, the answer is sexuality exists on a continuum.