pre-ref 24  

Ref. 24:
This reference (in English) is to the study report by Bailey-Dunne-Martin that thoroughly debunked the previous study by Bailey-Pillard (ref. 23).  They didn’t mince their words when criticizing the Bailey-Pillard study.  They wrote as follows (page 533; right-hand column) translated into your language: 

This suggests that concordances from prior studies were inflated due to concordance dependant ascertainment bias (that is sample bias). 

They further stated:

This study did not provide statistically significant support for the importance of genetic factors for homosexual orientation.

For a look at the original text in English click here (file size: 1.4 MB)