A Russian man died after guzzling a bottle of Viagra to keep him going for a 12-hour orgy with two female pals.

The women had bet mechanic Sergey Tuganov $4,300 that he wouldn’t be able to follow through with the half-day sex marathon.

But minutes after winning the bet, the 28-year-old died of a heart attack, Moscow police said.

“We called emergency services but it was too late, there was nothing they could do,” said one of the female participants who identified herself only as Alina.

Click here for more from The Sun.