I've read a great deal about Churchill over the years ... his mother was considered promiscuous by Victorian standards (perhaps because his father died from syphilis) ... but never Clementine. Both JFK and Clinton screwed around and so did their wives ... Jacki less so than Hillary ... so sexual drive (more or less) isn't relevant.
The biographer (sorry no name as I read this many years ago) insisted that Clementine was really tired of his inactivity.