http://www.dailymail.co.uk/news/article-2022688/Long-lost-father-jailed-...

Scroll down the article to the little box entitled "What is GSA?". Interesting. This may explain some of the inappropriate father/daughter relationships we read about on Step Talk.

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"GSA is rare between people raised together in early childhood due to a reverse sexual imprinting known as the Westermarck effect, which desensitizes them to sexual attraction. Experts believe that this effect evolved to prevent inbreeding."