The Sweet Pussycats (1969)

An officer and a count who live in opposite ends of the same castle bet each other who will be the first to bed their respective new 'virgin' maid. The winner will get ownership of the castle. In order to attain his goal, the officer ignores his lusty fiancee but she soon finds a luitenant to turn her attention to. Eventually a whole stable of local prostitutes gets in on the act.