Used to describe different levels or degrees of sexual experience. It is substituted for the base system, due to discrepancies amongst different people's definition of each base.
1 Star - Making out.
2 Stars - Boob touching, over or under the shirt.
3 Stars - Hand jobs, fingering, getting turkied, jerking.
4 Stars - Oral sex, carpet munching, head.
5 Stars - Vaginal or anal intercourse.
The stars make communicating how your weekend went easier amongst friends.
Dude #1 - "How was your weekend bro?"
Dude #2 - "It was awesome bro. I had a 5-Star weekend!"
"She's such a slut. I hear she went to four stars on four different guys in one night!"
Sexually Frustrated Person - "I've only ever had one star..."
"This star system is so much less confusing than the base system. WTF does it mean when someone says short-stop anyway?"