Source : Webster's Revised Unabridged Dictionary (1913)

Amorousness \Am"o*rous*ness\, n.
   The quality of being amorous, or inclined to sexual love;
   lovingness.

Source : WordNet®

amorousness
     n 1: a feeling of sexual love [syn: {enamoredness}]
     2: the arousal of feelings of sexual desire [syn: {eroticism},
        {erotism}, {sexiness}, {amativeness}]