It seems that economics students are the sluts of (at least)the UK University system.
So it might come as a surprise that economics undergraduates have been found to be the most promiscuous students on campus. A survey of 4,656 undergraduates found that economics students had nearly five sexual partners since starting university, compared to less than two for those studying environmental science.
Read more: http://www.dailymail.co.uk/news/article-2209275/Economics-students-promiscuous-campus.html#ixzz27pWKRQIR
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Physicists aren't mentioned in either top or bottom five, but I'm pretty sure they are too busy with problem sets for sex.