Mad as a flatmate

Over the years of student living I've had some great flatmates. Encouraging and engaging, humorous and gracious. There have also been others. Others whom on a mad-as-cheese scale would firmly land in the stinky Brie category.
One such flatmate who when I arrived home one night decided that it would be nice to offer me all the drugs in the world!...

...I decided against all the drugs in the world and instead went to bed. Several hours later I was awoken by the same flatmate.... naked, stood over my bed, saying, "Come on Tom, I want you to play with me!"

Quite why is it that this offer had to come from the fat, ugly, balding guy in his thirties and not the two hot Asian chicks that I also lived with?
Rubbishness.