Here is a great article in Psychology Today about Smell and Attraction. F.Bryant Furlow explains how research has shown that (oral contraceptives) trick the body's normal evolutionary mate selection process.

The Smell of Love

Why do some people smell better to you? A look at how human body odor influences sexual attraction.

The Swiss researchers found that women taking oral contraceptives (which block conception by tricking the body into thinking it's pregnant) reported reversed preferences, liking more the smells that reminded them of home and kin. Since the Pill reverses natural preferences, a woman may feel attracted to men she wouldn't normally notice if she were not on birth control—men who have similar MHC profiles.

You can find the full article here:

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