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MHC-mediated odor cues can be really important in mate choice, as they help the female determine whether a prospective partner’s immune system is compatible with her own.
When a monogamous prairie vole couple was given drugs that suppress oxytocin and vasopressin, their commitment to one another waned – they became promiscuous, and were less likely to defend and care for their partner.
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Testing boundaries with a prospective partner through intimate behaviour is seen in the elaborate courtship displays of wandering albatross.
They dance together, bow to one another, preen each other’s feathers, hit their beaks rhythmically together, and tilt their heads back to call to the skies.
A complementary experiment studied the meadow vole – the prairie vole’s doppelganger and close relative – a species that is normally promiscuous.
When given oxytocin and vasopressin, meadow voles adopted the monogamous behaviours of their cousins.A female will arrive at the lek with the sole purpose of finding a mate.She’ll check out the competition, compare their physiques, musks and courtship displays, and in the end decide which one to mate with.Females, on the other hand, thought size didn’t matter in their males. Each episode sees two pairs of strangers meet in a room furnished only with a bed and a large-screen TV.Instructions and questions flash up on the screen, first directing participants to strip each other down to their underwear.Smell wasn’t an important factor for male seahorse mate choice – they were more interested in bagging the biggest female they could.