Birth control can interfere with a woman’s ability to assess a mate.

It’s hard enough trying to pick a long-term partner; throw birth control in the mix and a woman’s ability to meet Mr. Right can become completely twisted. Under normal circumstances, a woman subconsciously chooses a man who would make a good genetic match.

But if she’s on birth control, the hormonal deluge flips her senses. For biological purposes, women prefer a mate who is genetically different from them to decrease the chance of abnormalities in offspring.

But according to a 2007 University of Liverpool study, birth control throws a wrench in nature’s grand plan by causing women to choose men who are genetically similar to them. Though no one is 100% sure why the pill affects attraction, some scientists theorize it may affect marriages in the long run.

A woman on the pill might start dating a man similar to her genetically only to find she is no longer attracted to him once off the pill. Food for thought if you’re dating someone on the pill.