yea iv started to think that too acctually, and i think you might be right about the natural insticts, i mean, even if they lived totaly seqluded, if they are attrackted to eachother, there are pointers that should give them a little clue here and there, BUT, then again, if they lived seqluded, then they problably been living in a very stright family too, and anything that has had to do with their genitals and feeling good must have been taboo, so when they got togheter, they might have hidden that part of eachother from one another....im not sure what to make out of this article after all...