If anything, I suspect Hitler was asexual, and too consumed with megalomania to worry about sexual relations. Eva Braun, in her diaries complained that Hitler barely ever payed attention to her. I suspect Hitler may have been using her as a beard, to cover up his asexuality.
That is essentially what Machtan states, that from early 1930's until 1945, Hitler was sexually inactive.
Without the blue dress, Monica Lewinsky would be trashed by the left as a weak minded girl manipulated by the vast right wing conspiracy. Linda Tripp's phone recordings would only mean Linda Tripp was a co-conspirator.
When the left wants to, they will declare an uncorroborated allegation to be proof beyond the shadow of a doubt. Then there are the assorted Juanita Broaddricks, Paula Jones and Kathleen Willeys who will be attacked by the left.