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Sure, sorry.  Here's one very good study with hundreds of references to other studies cited in its footnotes that support it. 

http://www-psychology.concordia.ca/fac/pfaus/Pfaus-Kippin-Centeno(2001).pdf

The artificial insemination industry in livestock and endangered species propogation has relied on the fact for years that young animals just before entering puberty can be trained to ejaculate on nearly anything by using classical conditioning training pairing stimuli with reward of orgasm.  After they're trained to the new object [with bulls it is often other castrated bulls called steers], they actually prefer that object to estrus females in order to ejaculate. 


ASPCA and Mare hate this fact and their only rebuttal, if you can call it that, is "people aren't animals!".


I assure you and so does the entire field of Comparative Psychology, they are.


As to the twins it is a pair of girls that grew up with my daughter.  She still keeps in touch with them through Myspace.  One identifies herself as a lesbian and the other hetero. They are identical twins.  Genetic theory is in the can on that one.  All it takes is one set of identical twins with differing orientation to disprove the genetic theory.


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