Gay rights groups have today attacked The Sun's offer of giving 50 grand to the first couple to have full sex in the BB4 house.

The deal, promised in today's edition of the newspaper, will ensure a big cash payout to the housemates if they do the deed -- but only if they're heterosexual.

"We think it's bizarre the Sun is excluding lesbian and gay people from their contest," Sacha Deshmukh, director of parliamentary affairs at pressure group Stonewall told the Media Guardian.

"Brian and Anna, two previous gay and lesbian contestants, topped the competition and their subsequent media careers have been strong compared with other straight contestants who have sunk without a trace."

"The Sun's competition is clearly out of touch with Big Brother viewers, who have shown they reject homophobia."

No-one was available at The Sun for comment.