Fear of Infection and Human Behavior

Could an unconscious fear of infection be a driving force in human behavior? If so how did it evolve?

This article from Psychology Today suggests a strong unconscious fear of infection.
http://www.psychologytoday.com/blog/sex-murder-and-the-meaning-life/201106/do-unconscious-fears-infection-affect-your-social-life

Could sexual relations partly be to not only mix genes, but mix each others bacteria in a way that helps each support the good bacteria they have, defend against the bad that they have, and trade bacteria in a way that makes each more healthy and compatible with the other?

This article on kissing benefits:
http://www.dailymail.co.uk/health/article-1224249/The-unromantic-truth-kiss–spread-germs.html?ITO=1490

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