sophomore boy
The cool ones hang with juniors and seniors, attend junior and senior parties, etc. The rest are far to embarrassed to be seen with freshmen but aren't cool enough to go to junior/senior parties so they are stuck with eachother. Some sophomore boys can be quite cute. Most of them are still growing, though... give them another year and they'll be hot.
There's usually that one incredibly hot sophomore boy who plays all varsity sports and has hooked up with all the attractive junior and senior girls.