The Collaborative International Dictionary of English v.0.48:

Paramour \Par"a*mour`\, Paramours \Par"a*mours`\, adv.
   By or with love, esp. the love of the sexes; -- sometimes
   written as two words. [Obs.]
   [1913 Webster]

         For par amour, I loved her first ere thou. --Chaucer.
   [1913 Webster]