Female mosquitoes tend to have a preference for biting some people over others. The exact reasons for this are not yet fully known, however.

It is understood that carbon dioxide is one of the biggest attractors, causing mosquitoes to travel from up to 35 meters away to feed on their chosen prey. Some people, including those who are overweight or pregnant, naturally give off more carbon dioxide than others.

Body heat, movement, and body odors such as sweat and lactic acid also play a role in attracting mosquitoes.

Some research suggests that beer drinkers are at a higher risk of being bitten by mosquitoes.

http://www.istylmagazine.com/lifestyle/health/mosquitoes-beer-drinkers-are-at-a-higher-risk-of-being-bitten-researchers-say/

Interesting!