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They have published a study they carried out in the Personality and Social Pschology Bulletin.
The men with the muscles it seems attract the girls looking for virile mates. The study author, David Frederick, says women are more attracted to brawny men, especially for an affair. For a life partner, however, women tend to pick a regular man over a mate with huge biceps - which is good news for the average man!
The findings were based on interviewing 99 male undergraduates and 141 college women.
The muscular men were twice as likely to have had more than three sex partners than the less well built types. The women were asked their preferences by looking at six different male silhouettes.