A flask in your purse or under your dress is always necessary for as many reasons as you need your handy lip stick that seems to never run out.
You might not like the wine that he orders at what ever fancy restaurant he takes you to.
He might be Baptist and not drink at all, so while he’s in the restroom or not looking, pour some tequila from your flask in to your drink.
He could be a lot drunker than you and ready to take you home, so you need this extra supply of alcohol to make through the Uber ride back to his place.
You might need it after sex because he only lasted 5 minutes and was ready to go to sleep.
You might be at a party with him that didn’t involve alcohol because apparently, some parties don’t involve alcohol but they do involve bbq.