Heavyweight thrusts of 440lb Gregg Casarona smashed skinny girlfriend's head through a concrete wall, giving her a concussion.

Virgin Gregg Casarona felt the earth move the first time he had sex - unfortunately it was the masonry falling as his girlfriend's head bashed through the wall.

Morbidly obese Gregg Casarona had been dating Jen Gerakaris for a month when they decided to sleep with each other.

Unfortunately as 31 stone Casarona became Cassanova he failed to take into account the power behind his near quarter of a ton weight.

As the amorous 21-year-old and his 8st girlfriend got intimate, her head went right through the wall behind them.

Gregg said: “My initial reaction was, ‘I killed her. This is my first time. And Jen is dead.''

Fortunately she saw the funny side and as he freed her head she quipped: "Why did you stop?"

She said: "I wanted to lighten the mood."

He took her to hospital where she was treated for concussion.

The incident happened eight years ago but is now being re-enacted on TV series Sex Sent Me to the ER which premiers in the USA on December 28. The pair are no longer together.