I threw myself at her feet and begged her to yield to my desires at once; but she ordered me to hold fire until we were in bed.
“I do not want” she said laughing “to have to worry that your quintessence will fall on the rug. You shall see!“
— from Giacomo Casanova’s (1725-1798) memoir ; he is recounting a particularly passionate and amorous time with a nun (he loved nuns). ‘Quintessence,’ in this context, means exactly what you think it means.