Thousands of people suffer repetitive strain injury in their wrists - because they are having too much sex.

RSI is normally associated with excessive computer use, but now experts think it could be due to too much nookie.

Boffins claim carpal tunnel syndrome can develop because of the weight people put on their wrists when having intercourse in the missionary position.

Dr John Zenian suggests that the condition - already one of the most prevalent forms of RSI - is only going to get worse.

He says that because people are getting heavier they are putting more stress on their joints… clearly Dr Zenian needs a copy of the Kama Sutra.