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I read an article that said that 50% of college students admited to have some kind of sexual encounter with a sibling, but of course this was in the experimenting zone and it included things like mutual masturbation and oral, the percentage of those that admited to have intercourse was much smaller.
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With those kinds of surveys, volunteer bias clouds results, so I'd take that study with a grain of salt. Those particularly squeamish about a certain subject (i.e. incest, which the public is generally uncomfortable with) tend not to participate, which can significantly skew the data.