Now, that's a bit naughty because those who write about folklore and indeed know quite a lot about it, are not polarised in that way. Not at all. Indeed in OFS you will find that Tolkien himself dislikes Bowdlerisation, and would rather they stayed in their true 'adult' form. He did not set the aspects some readers are uncomfortable with 'aside' from his view of Fairy Tales.
In fact, and this has been asked before, was LotR and The Sil (the Hobbit is excluded from this) Faerie Tale
at all? Was it not something different, i.e. myth? If indeed it was, then being 'high, purged of the gross' would fit perfectly.
On the point of 'cultural degradation' arising from concern with bodily matters, ahem, I'm going to resist giving you a lecture on how the culture of ordinary people, particularly women, has
always included lots of this, as far back as we can identify 'culture'. It might be distasteful to some men (and women), and indeed we might ask if it was distasteful to Tolkien (and it's a fair question, and if indeed it was, then I am
not saying if this is right or wrong).
By the by, Tolkien's work might not have that much sex in it, but it is certainly there (in extreme forms such as incest) and he does not shy away from the Gothic and horror.
Oh, and another good writer on Fairy Tales - Maria Tatar. They had a book with an intro by her lying around in one of our art galleries today and it was very interesting stuff.