A student has described how she saw a cyclist – complete with helmet – having sex in some bushes on a common in southwest London.

University of Roehampton English Literature and Philosophy student Sian Carpenter was travelling along Putney Commondale on Monday afternoon when she spotted the amorous couple.

> Team Sky reported to have tested whether Viagra helps riders’ endurance

The 21-year-old told The Sun: “I was on a bus going past Commondale and I saw a cyclist only slightly behind the trees, in the full get up – even his helmet.

“So obviously I’m thinking ‘what’s he doing there’ so I glanced over and that’s when I saw the other person in front of him and the penny dropped.

“It was so funny. I doubted if that was what actually was happening though, then another person on the bus reacted and turned round really shocked so then I knew I was right.

She added: “What was weird to me was that the other person was just dressed normally in a coat – I don’t know how it would have happened.”

We don’t know either – but it has got us wondering whether Team Sky are still testing out the performance-enhancing benefits of Viagra and, if so, which of its riders might have been training in the area yesterday?