MOsquitos like the smell of sweat, so if you sweat, they like it. They especially like sweet smelling sweat, so I guess if you eat sugary things or drink pop they might like it, too.

They are also attracted to dark clothing.

could be the soap you use. They also like fair dry skinned people. I do not know why

I've never understood their choices either! When I used to go fishing all the time with my father-in-law, I would be devoured, and he would not even be sampled! I have no idea why, but it's ridiculous!

From Rutgers Entomology Mosquito homepage. Their answer is "We Don't Know" http://www-rci.rutgers.edu/~insects/mosfaq.htm#q4 Why are some people more attractive to mosquitoes than others? Scientists are still investigating the complexities involved with mosquito host acceptance and rejection. Some people are highly attractive to mosquitoes and others are rarely bothered. Mosquitoes have specific requirements to satisfy and process many different factors before they feed. Many of the mosquito's physiological demands are poorly understood and many of the processes they use to evaluate potential blood meal hosts remain a mystery. Female mosquitoes use the CO2 we exhale as their primary cue to our location. A host seeking mosquito is guided to our skin by following the slip stream of CO2 that exudes from our breath. Once they have landed, they rely on a number of short range attractants to determine if we are an acceptable blood meal host. Folic acid is one chemical that appears to be particularly important. Fragrances from hair sprays, perfumes, deodorants and soap can cover these chemical cues. They can also function to either enhance or repel the host seeking drive. Dark colors capture heat and make most people more attractive to mosquitoes. Light colors refract heat and are generally less attractive. Detergents, fabric softeners, perfumes and body odor can counteract the effects of color. In most cases, only the mosquito knows why one person is more attractive than another.