Experts claim that homosexuality in the animal kingdom is 'widely observed' by biologists but left underreported. From mounting to penetrative sex and 'genital-oral contact', animals engage in a variety of 'widespread and natural' sex behaviours in the wild.
'Same-sex sexual behaviour occurs more frequently than what is available within the published record,' Anderson and colleagues say in their paper. 'This may be due to a publishing bias against anecdotal evidence.'
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