Experimentation is not always a good idea - ask Ivan Sokolov and wife Valentina who learnt it the "deck chair" way.
Sokolov, 56, and his wife were rushed to hospital after they got trapped in a position from the Kama Sutra sex manual.
Horrified Sokolov found himself stuck fast when his 51-year-old wife had a muscle spasm as they romped in a position known as the "deck chair" - or Indrani as it's traditionally called.
The position involves the woman drawing up her knees so her feet are jammed under her partner's armpits.
After failing for an hour to free themselves the embarrassed couple dialled paramedics in Kalhuga, central Russia, for help.
"The man was so desperate to escape he eventually pulled himself free but his poor wife needed treatment for her spasm," The Sun quoted a medic, as saying.
The couple had been given the book by a friend and had decided to try out some of the positions for the first time.
"You need quite a high level of fitness for some of these positions. An average middle-aged couple like this would find a lot of them quite challenging," said one expert.