It's cool if your girlfriend is the type who can easily fit in and become 'one of the guys,' but what happens when she becomes too friendly? According to a new University of Chicago study, it could lead to problems in certain areas i.e. the area between your legs.

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Sexual dysfunction is often associated with physical factors like heart disease, but it can also be psychological. Researchers had examined almost 700 men from the ages of 57 to 85, and found that men were likely to report erectile dysfunction when his partner had more contact with his friends than he did. The findings showed that 46% of men with extra-friendly partners had ED, compared to 33% of guys in the opposite situation.

The expert theorize that by not having an independent social life can reduce your self-esteem and increase your risk of anxiety and depression—all of which are linked to erectile dysfunction. However, always be open with your partner and explain that it’s ‘guys’ night’ so that she knows you're not trying to make plans behind her back.