Okay so love. What a marvelous thing, huh? I want it, you want it, everyone wants it, right? Oh and its such a mystery to us all. But for all those people who like someone or if you're in love or if you love someone, its only because you like they're scent. Yes, they're scent. Its when you finally get a good whiff of them[[They're real scent. Not they're cologne, or soap, etc]] is when you actually know if you are actually attracted or not. But this trick only really works with girls because they are the ones who have a greater reproductive burden or just make it simpler...women have babies. And its all has to do with the males immune system. Female are attracted to the scent of males who are more immunologically different to them. The difference lays in the sequence of more than 100 immune system genes known as the MHC, or the Major Histocompatibility Complex. These genes are code for proteins that help the immune system recognize pathogenes[[a microorganism that causes disease]]. And usually the scent reminds them of their past lovers, which suggests that this does affect a woman's dating decisions in real life. Like seriously,  one day just tell your lover not to wear any cologne,  scented aftershave, scented soap, basically nothing with a scent so that you can smell what they really smell like and see how you feel and see if this scent make you feel safe and turned on at the same time? Or if it just makes you want to sit there and be like, "...ew"? Women subconsciously do this scent thing because they want children who are more disease-resistant because with the more immune genes expressed, the less the of a chance the offspring is going to be diseased or becoming diseased. But there is one thing that can affect this. Its the birth control pill.
  
    Birth control makes a woman ovulate less[[obviously]] but this causes a woman's body to think she's pregnant. And since pregnancy is such a vulnerable state for a woman, it activates a preference for family or people who are just genetically similar to them and who will serve as a protector. In other words it makes it so that females are more attracted to males who have a similar MHC[[its like marrying your cousins]]. So basically, when women are in a relationship with a man when they're on the pill and when stops taking it, her smell preferences go back to normal and then she may not be attracted to that person anymore because of the lack of difference. And this could cause fertility problems and weaker children. So if you're looking for a man to be the father of your child, make sure that you go off the pill first and then start your search.

    But according to a study, the pill can affect men too. Research shows that men are more attracted to females who are off the pill rather than on. This experiment was took place at an erotic dance club. It showed that non-pill dancers made about 50% more tips than dicers who were taking an oral contraceptives. In other words, women who were on the pill were two-thirds less attractive than women who weren't. The biggest earners were the non-pill users who were ovulating. Other studies have show that men are attracted to women at their most fertile point in their menstrual cycle. We're not exactly sure why this happens though. It could be a shift in their psychology, their tone of voice, or the kinds of pheromones the women is releasing.