@Maenad Found it ! (it was in fact just above what I posted :/ )
There's as well Blanchard's "explanation".
Somewhere else in the book she sais that for Blanchard it's actually like sexual intensity in an married couple. https://witches.town/media/KK31WYN659YCoGXJNOc https://witches.town/media/QPUUhmp3dw9l8I5sQNM