Caught from Behind 17 (1992)

Step to the Rear. Everyone's favourite proctologist is back, butt, boy, is he bummed! It seems his luscious nurse, Fanny, has turned tail and run. Butt not to fear, new nurse Bottoms and a beautiful bevy of ravenous rump-humpers can hardly wait to drop their drawers and lift his spirits. Can they make him forget Fanny? You bet your ass!