Some research has suggested that facial symmetry determines attractivness, i.e. the more symmetrical your face, the more attractive you are.
Other research has shown that our personal smell holds clues to our immune system, even though we are not consciously ware of it, we are attracted to people with a complementary immune system, i.e. someone who has a differing immune system from ourselves so that any offspring will have wider protection, this is meant to be the human pheremone.
Hope this helps :)
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