1. Important to note this is a British study that probably didn't poll very many American college students. 

2. I'm not sure what Studentbeans.com meant by sexual partners. I.E.: 4.8 active partners at the same time or cumulatively over a traditional four-year college experience?

In conclusion, economics majors should probably spend some time crunching the numbers and figuring out a few new sophisms to conclude that they are, in fact, the most sexually active majors on campus.