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It is clear that our findings, if confirmed by further research, are only one piece in a much larger puzzle on the nature of human sexuality, they said.
In 2002, the Nuffield Council on Bioethics produced a report into the possible link between genes and behaviour, which included sexual orientation.
It concluded: There are numerous problems with genetic and other biological research into sexual orientation which mean that any reported findings must be viewed with caution.
It said many of the genetic studies were too small to draw definite conclusions from.
Alan Wardle from the gay rights charity Stonewall said: This is an interesting debate and there may well be a genetic element, but its not conclusive.
It does not really matter whether it is nature or nurture. The important thing is getting equality for homosexual people.
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