Ask the Little Bald Bastard

Dear Little Bald Bastard,
  Someone recently asked me if I was good in bed. How can I tell if I am? How do you know you are?
- Vexed
Dear Vexed,
  You know you're good in bed if, after sex, you and your partner collapse in a sweaty, exhausted, satisfied heap, arms and legs akimbo, and lie there together for a few minutes, savoring the afterglow.
  Also, if she says something complimentary and gives you your $100 bill back, that's a good sign too.