There are a lot of them. This is one for dating off-line.
DON'T leave personal belongings (purses, wallets) or drinks unattended. Don't risk having your personal information stolen. The same goes for your drink — don't risk having it tampered with.
Tip: If you must leave your drink unattended to go to the restroom, order another when you return.
Here's another one.
DO stay sober. Refrain from drinking excessively, as it could impair your ability to make good decisions and may put you at risk.