Mar 24, 2011 8:14 PM GMT
Sexual preference chemical found in mice
The researchers say it is the first time that a neurotransmitter has been shown to play a role in sexual preference in mammals.
Experts have warned about the dangers of drawing conclusions about human sexuality.
Sexual behaviour in mice is thought to be driven by their sense of smell.
Professor Keith Kendrick, a neuroscientist at the Babraham Institute in Cambridge, said: "In terms of having potential relevance to understanding human sexual preference/orientation, we are of course far less influenced by odour cues in this context than mice are.