EXCLUSIVE

Adrien Broner just learned the hard way … if you’re going to record a threesome on your phone — DON’T LET IT GO PUBLIC!!!

A Nevada court just ordered the boxer to fork over $175,000 (plus other fees) to one of his co-stars from a 2013 romp after the footage mysteriously surfaced on World Star Hip Hop. 

Broner had argued that he didn’t intentionally leak the video (which was shot with the consent of his 2 partners) … but he had lost the phone he shot it on and someone else posted it. 

So, why didn’t Broner have a password on his phone? 

The boxer testified that he has 3 phones on him at all times — a business phone, a family phone and a “ho phone” (his actual words). 

Broner says he simply never bothered to password protect the ho phone — so anyone could’ve had access to his x-rated library. 

The jury bought Broner’s story and found that he did not act intentionally … just negligently … and ordered him to fork over the $40k in lost wages and $135k for pain and suffering. 

The plaintiff’s attorney, Kevin Hansen, tells TMZ Sports, “I’m happy to see that the jury saw through the defendant’s games. They saw [my client] for who she is and Broner for who he is.”