Green’s Dictionary of Slang

sexual excitement, lust.

1963		T. Pynchon V 37: He was visited on a lunar basis by these great unspecific waves of horniness, whereby all women within a certain age group and figure envelope became immediately and impossibly desirable.
1976		R. Price Blood Brothers 155: She figured Stony was climbing the walls with horniness.
1997		L. Davies Candy 5: Everything was electric, the horniness, the erections, the wetness.
2000		N. Griffiths Grits 437: This comedown depression invariably comes with a rampagin, irrepressible hawniness.