Twins Sam and Amanda Marchant secretly swapped roles in a kinky sex game to see

Moaning

"She was away for the night so Rich and I knew we'd be sleeping with the twins--though we never expected it to be anything other than in separate beds.

"It was late and the DVD we'd been watching had finished. The girls were a bit tipsy and went to bed, asking us to fix them both a drink and follow them up. So up we went--into their respective rooms, wishing each other the best of luck!

"The lights were dimmed and it was just dark enough to fool me.

"On Big Brother they do all this 'We love pink' stuff. And even then their bedrooms were pink and their beds were covered in pink, fluffy cushions and decorations.

The girl I thought to be AMANDA was already in bed so I stripped off and climbed in beside her.

"At first she lay still. So I started by stroking her back then started sliding my hands over her body--I certainly through I recognised all the curves. Then I started to kiss her on her neck and down her back.

"By now my hands were all over her and things were starting to get really steamy--and she was responding, moaning and groaning.

"By now I was getting really turned on and started to take things further, we were getting to boiling point...and that's when I got an elbow in the face! She screamed, 'I'm SAM!' I couldn't believe it.

"At that point I could hear a commotion in the other bedroom. Rich had obviously just found he was in bed with Amanda. It was wild. We ran out into the landing, stunned. The girls are so similar it's impossible to tell the difference."