The things you put on your skin to soften it and make you beautiful can also be very strong attractants, ... Many of the ingredients in cosmetics will attract mosquitoes. And while a repellent may offset that, most times the cosmetics and creams last longer than the repellents.
Mosquitoes use odor to sort attractive people from the unattractive people to find those that are most tasty.
People who think they attract mosquitoes are the ones at largest risk of mosquito-borne disease. They'll have a hundred mosquitoes feed on them when a normally repellent person might have five. It's that kind of ratio.