British scientists have found that women who take birth control pills have a harder time choosing a genetically suitable partner. Modern oral contraceptives contain hormones similar to those synthesized in the body. The main purpose of birth control pills is to prevent unwanted pregnancy. Oral contraceptives, in addition to unwanted pregnancy, also protect against the formation of cysts in the ovaries. When the girl takes oral contraceptives and has no unpleasant side effects, the ovaries practically do not form follicles, ovulation stops and these ovaries are kept healthy for the moment when the woman will want to get pregnant. In this period, when a girl does not want pregnancy, but has hyperactive ovaries, prone to form functional cysts, the use of contraceptives is appropriate. In the years in which, regardless of being prepared in a biological aspect, but not wanting pregnancy, a woman can preserve the health of her ovaries. It is known that oral contraceptives cause a false pregnancy in the woman’s body with all the side effects – feeling of nausea, headache, chest tension, intermenstrual bleeding, which is common in the first 2-3 months, abdominal pain. In addition to these typical anti-baby side effects of the pill, scientists have found that contraceptives can alter women’s innate ability to choose a genetically suitable partner based solely on his smell. This ability is related to the genes of the immune system, which ensure the birth of healthy children, and in most cases it is subconscious and the fairer sex is not even aware of it. The results of the conducted scientific experiments show that the participants taking oral contraceptives are much more likely to choose representatives of the opposite sex whose smell is similar to their own. Researchers remind us that we are subconsciously attracted to people who smell different from us. According to the authors of the study, the effect that contraceptives have on perceptions can affect not only the ability to reproduce, but also lead to the breakdown of the relationship. Scientists suggest that women may lose interest in their partner if they stop taking oral contraceptives or start taking them.