Known as the ‘happiness hormone,’ serotonin seems to function as a “mating call” for male mice.
What’s interesting is that when such mice are placed among both male and female mice, they are indifferent to both types. However, when a serotonin deprived male is left alone with another male, he’ll proceed to “mount the male and emit a mating call.
This sudden preference for other males can be reverted, however, by injecting serotonin into the mouse’s brain.
Note that this study is very inconclusive, in that it cannot be used to explain human sexuality.
“Any potential links between serotonin and human sexual preferences must be considered somewhat tenuous,” Professor Keith Kendrick said.
The results do show, however, that neurotransmitters play some sort of role in regard to sexual preference—or at least with animals.
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