Dear Kaiserin Sissi,
I think Mrs Yseult is kidding with you !
The sexuallife of our napoleonic rulers was rather more active...
between so many mistresses of the two men we can find :
for Napoleon 1
Marguerite-Joseph Weimer, known as Mademoiselle George (1787-1867) , a very good actress of french theatre - she became his mistress when she was sixteen.
Giuseppina Grassini (1773-1850), an italian opera singer (very brave)
Elisabeth Le Michaud d'Arçon (1874 -?) a lady-in -waiting of Josephine
Caroline Chevalier de Lavit (1780-1850) , a very talented soprano singer, married to Branchu, a dancer.
and so on and so on ... and during the exile at St Helène Albine de Montholon. probabely the last one...
for Napoleon 3:
so many girls in Italy, Swizerland, England... Eleonore Vergeot was the daughter of his gaoler (at Le fort de Ham) and you can immagine when he was not jailed... Anyway we can certainly write the name of Louise de Mercy-Argenteau, his mistress at the begenning of his life as a ruler (1848-1853).
I am not a specialist of the mistresses of the Bonaparte, anyway, if you are interested I can tell you something about Mlle Georges, G. Grassini and C. Branchu. About E. Le Michaud d'Arçon, there is a recent book in french. (a sad story). My english is very bad, so I need time to write a text...
I remain anyway your (and to Mrs Yseult) humble servant
Mr Canard