I found a bug. If you pick a female for male, the "vagina" zone isn't positioned properly.
Changing Lines 105 and 106 in src/MotionSource/MaleFemaleMotionSource.cs:
_referenceUp = Vector3.RotateTowards(_referenceUp, -targetUp, -Mathf.PI * 0.27f, 0f);
_referenceRight =...