We had a few more beers. By now it was late. I announced that I was going to bed. I went to the tent, which was very hot inside, and stripped to my boxers, before climbing into my tent. It was pitch black inside. I was soon asleep and didn't hear the girls coming to bed.

What woke me up was a hand straying into my sleeping bag. It was so hot I hadn't zipped it up. Still feeling groggy and barely awake, I felt the hand slide down my stomach towards my boxers. I opened my eyes but it was so dark I couldn't see anything. The hand then...