Don't look a gift horse in the mouth.

Mr Smith looked over his desk and said to the young lady standing in front of him did you do what I said?

The young lady nervously lifted up her skirt showing him that she was not wearing any knickers and smiled.

Mr Smith stared over his desk at the beautiful shaved crotch in front of him and said you're a good girl now come over here and sit on my lap and we'll see what we can do about you're failing grades.

Mr Smith did not feel at all guilty in taking advantage of the naive young men who were just too eager to give it away like Francis in front of him who had only been a girl for 6 months but had already given his favours to most of the male teachers for better grades.