It is said also that if the "work of Venus" takes place in the same place or nearby it will happen, as is proved a number of times, at once the stone will sweat great drops. Similarly, in addition, if a man and woman practice acts leading to degradation in that very place [it occurs]. Out of the congress actually finished in that place, at no time has any one going to bear a child born one. From which, and on account of this, the small hut, deserted inside, which was formerly customarily there in that place, only by a fated/deadly wall of rock the stone you may see encircled [ie. only the wall of the hut surrounds the stone with some kind of accursed wall??]. 1
Which may explain why Henry Rowlands*, who was both an antiquarian and the local vicar, never mentioned the stone. Given that Gerald was writing in 1187 CE one is loathed to bring up pagan survival, but given all the above, and that Lewis* reported the old church was "erected in an inclosure almost circular, surrounded by 'tall ancestral trees'", the dumping of the rock in whirlpools, and that the bones of St Nidan stored at the church may actually be those of a woman*, one does get the feeling that back then, this wonder had more about it than meets the eye.