The lass bobs up and down on the sex toy enthusiastically but the barman refuses to hand over her alcohol – as she failed to "deep throat" the item.
The strict bloke makes her swallow more of the phallus before he finally releases the "stiff" drink.
The girl is initially coy – smiling sweetly as she agrees to play the game.
She laughs as the dildo is placed on the bar – but looks confused as the very willing barman clambers over the bar.
As he sits on the table top with the fake willy between his legs, she realises what she will have to do – and covers her face with her hands.
Randy punters cheer as they realise they are going to see a free sex show.
The girl grasps the base of the shaft with her left hand, pops the toy in her mouth and swallows.
But the barman is less than satisfied.
He says: "You took it only 13 centimetres deep.
"To get free tequila you need to swallow at least 14cm."