Getting buzzed passing the bottle
Teenagers don't always have a lot of money. That's why they pass around the bottle. They don't have the cash to buy a bunch of bottles. They just want to catch a hum and then screw. Of course while they watch their allies do the exact same thing. Couples like these receive so turned on explosions every other have sex. Receive in on the sheer pleasure and be the fifth set of eyeballs!