Most Helpful Guy
When I was in High School (16 years old), whenever I saw a girl wearing a miniskirt or short shorts showing off her legs (soft legs, athletic legs, stocky legs whatever) my mind crashed into the gutter. She instantly gained 3 points on the rating scale, at minimum.
No other body parts had the same effect. If she had a cute face, that also boosted her appeal. That's just me, and when Spring rolled around, my grades started to dip because lecture became all about the girl sitting at 2 o'clock.