[Huliwang]

Is it below the LP ?

The hui yin point is located between the testicles and anus (male) and between the vagina and anus (female). To get the exact spot you must apply light pressure and run an index finger from the testicles to the anus and locate a dip or groove/depression and that is the spot. 

It is also the point male uses to stop ejaculation to prolong sexual act. This used to be a secret and rich towkays will pay the Taoist masters a million dollar to show them the exact spot. That's why some people called it the million dollar point............