Before I start on Diane de Poitiers I must answer your questions about Henri II and Catherine de Medici and their “genitalia” problems. We will never know for sure, but in those days – and till relatively recently – there were a lot of horrific misunderstandings. I think we can fairly safely assume that the young king did not realize quite what he was supposed to do. We know that Diane de Poitiers became his mistress a year after his marriage to Catherine de Medici, so we can be pretty sure that she taught him anything he needed to know. We can be equally sure that he already knew most of it via previous mistresses … yet with his wife he apparently did not perform and both he and his wife were confused as to why she didn’t get pregnant.
For this blog in full and more please see http://www.turquoisemoon.co.uk/blog/diane-de-poitiers-1499-1566/