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Every time they had intercourse during the three-month study period, each couple measured the time to ejaculation with a stopwatch.
http://news.bbc.co.uk/2/hi/health/7987061.stm
Every time they had intercourse during the three-month study period, each couple measured the time to ejaculation with a stopwatch.
http://news.bbc.co.uk/2/hi/health/7987061.stm
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