It makes a lot of scents! er, sense. There have been quite a few studies over the years on "partner compatibility and smell." There's some bit of the genome

It makes a lot of scents! er, sense. There have been quite a few studies over the years on "partner compatibility and smell." There's some bit of the genome (MHC) where "most opposite" works best for creating healthy kids, and somehow or another, women can detect this by smell. Give a group of 10 women a bunch of sweaty t-shirts, and they'll all have a different preference for which one smells best - based on that particular genetic difference from them. https://www.researchgate.net/publication/13864652_Body_Odour_Preferences_in_Men_and_Women_Do_They_Aim_for_Specific_MHC_Combinations_or_Simply_Heterozygosity https://www.researchgate.net/publication/13864652_Body_Odour... and associated similar studies all find the same thing. Of course, hormonal birth control throws this whole system for a loop. :/ Also found repeatedly in studies on the matter.