Foreplay - the 'naughty' things done before getting on to sex -is overrated, finds a new study based on 2,300 women. According to the survey, when it comes to the likelihood of having an orgasm, foreplay has little or no significance. On an average, the duration of intercourse is 16.2 minutes on average, and it is the clincher. The research's findings suggest that sex therapists, who emphasize the value of foreplay, may have that been getting it wrong