This study has already been published back in 2008:
The present study sought to expand the limited evidence that sexual orientation is influenced by genetic factors. This was accomplished by seeking statistical differences between heterosexuals and homosexuals for four traits that are known to be genetically determined: eye color, natural hair color, blood type, and the Rhesus factor. Using a sample of over 7,000 U.S. and Canadian college students supplemented with additional homosexual subjects obtained through internet contacts, we found no significant differences between heterosexuals and homosexuals regarding eye color or hair color. In the case of blood type and the Rh factor, however, interesting patterns emerged. Heterosexual males and females exhibited statistically identical frequencies of the A blood type, while gay men exhibited a relatively low incidence and lesbians had a relatively high incidence (p < .05). In the case of the Rh factor, unusually high proportions of homosexuals of both sexes were Rh- when compared to heterosexuals (p < .06). The findings suggest that a connection may exist between sexual orientation and genes both on chromosome 9 (where blood type is determined) and on chromosome 1 (where the Rh factor is regulated).
Source:
Please be aware that above excerpt is only the abstract and not the entire study, which you can purchase here.
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This study is interesting but I feel that it is inconclusive. It seems that many of these type of studies have forgotten to take into consideration the Dominant and Recessive genes when blood typed. A person can have a Dominant Negative gene and that same person can have a Recessive Positive gene inherited from either their mother or father who carried the positive gene. It would be much more interesting study if both of their Dominant and Recessive genes were found to be Negative. I read many years ago that the Dominant and Recessive gene being different was what was believed to be a problem with some of the organ transplants in the early years. After I read this, I have always felt that it was important to know both the Dominant and Recessive gene of any person since it too plays an important part of the person.
I live in a small town and most of my friends and customers have negative blood which I find so interesting. We share much knowledge about ancestry and family. And many of us in the past few years found that we are related thru our DNA testing. I feel that science will continue to see many changes as more people continue doing DNA testing. In my own family and family line we are mostly made up of negative blood lines. In my family line, we do have a few family members that inherited their Dominant positive gene blood type from either their mother or father. And that positive mother or father had a parent that was Dominant negative too. So basically what I am saying is that with the people who are Dominant positive blood types their Recessive gene could be Negative because some of them could have a parent who is of Negative blood type.
“Among homosexuals there’s less type A and more in lesbians”…
Could that be because of the steppe origin of European males?