A 16 month study by the McBride-Bjorn Burgsen Foundation of Sweden has concluded gay men's brains are "turned on" or 'excited' by other men's penises.

The study seeks to lay to rest the age-old controversy over whether homosexuality is inborn or a 'lifestyle choice'.

Lara Snordsen, a researcher on the study, said it showed that "gay men are 'chemically turned on' by the sight, taste, smell and feel of other men's penises".

She went on to say that "the study showed that the reaction was very similar to that of women.... provided those women aren't lesbians".

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