More Evidence Opposites Attract

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More Evidence Opposites Attract
Researchers find evidence we instinctively sniff out our opposite when looking for sex.

Words may fail us when attempting to explain away the intense carnal pull you feel for some but not others. Sure, it could be a whip-smart sense of humor, stunning penthouse apartment or even more jaw-dropping physique (all viable options), but perhaps (just perhaps) you two have such drastically different genetic backgrounds that your bodies just ache to reproduce. Pregnancy Rates For Lesbians And Bisexuals On Rise

Scary as it sounds, a group of Brazilian researchers certainly think this may be the case and claim their latest work will prove this theory even more so. Professor Maria da Graça Bicalho, head of the Immunogenetics and Histocompatibility Laboratory at the University of Parana, Brazil, says people who have contrasting histocompatibility complexes often end up marrying and having more children than those who don't.

Histocompatibility complexes, in layman's terms, are a bundle of dense genes that aid in immunity, reproduction and autoimmunity. Like pheromones, differing histocompatibility complexes (which shows itself through body odor), can be added to the list of never ending theories for those illogical pangs of attraction.

Bicalho and her team rounded up 90 married couples and 152 randomly selected (not married) control group couples and compared their histocompatibility complexes (also known as MHC). The researchers concluded that, yes, the married couples "had significantly more MHC dissimilarities than we could have expected to find simply by chance."

She thinks this is a very sophisticated filter system humans and the animal kingdom have used since the beginning of time in order to ensure that inbreeding didn't occur. In fact, a drastically differing set of genes only makes offspring stronger and more prevalent.Attraction At First Eye Contact?

"Although it may be tempting to think that humans choose their partners because of their similarities," says Professor Bicalho, "our research has shown clearly that it is differences that make for successful reproduction, and that the subconscious drive to have healthy children is important when choosing a mate."