Half a dozen cars were already parked up with drivers inside.
Foster, wearing a parka, stepped out of his car and disappeared into the bushes.
And in 2012 he became a pundit, commentating on the Olympic swimming in London.
Foster, dubbed British swimming’s bad boy early in his career, has admitted smoking drugs as a teenager.
One dogger told The Sun: “It’s a popular place for dogging. “You don’t make dates, you just turn up and have sex with whoever turns up.
“It’s like a sex playground and absolutely anything goes on in those woods. “Locals walk dogs, but everyone knows it’s also used by people who don’t have time for dates and who go there, get off and go.
Foster, who appeared in the sixth series of Strictly Come Dancing, is also the face of nutritional supplement Wellman and has formed Fitsteps with two Strictly dancers.
In his role as a pundit, the star appeared in the BBC’s coverage of both the 20 Olympic Games.
At least one visitor was a man wearing a dress and woman’s wig.
MARK Foster made his swimming breakthrough winning bronze in the 1990 Commonwealth Games and represented Great Britain for 23 years.
But he did not get out and drove off in less than a minute.
He was also seen in the same vehicle at 12.27pm on November 24.