:"A 1948 American Statistical Association report entitled Statistical Problems of the Kinsey Report on Sexual Behavior in the Human Male concluded ... Kinsey employed unrepresentative proportion of prison inmates and pedophiles to obtain data about child sexual behavior. ...  Kinsey's colleague Abraham Maslow also pointed out the bias inherent in people volunteering information." 
 :In short, there are some valid concerns about the selection methodology used in the report.  There were a disproportionately large number of inmates, for example.  And of course any interview-based study inherits bias from those being interviewed and those doing the interviewing.  This article has improved a lot from when I first added an NPOV tag.