Mosquitoes choose victims by their gender

In reality, gender does play a role, but not in the way most people think. As one report in the Annals of Internal Medicine pointed out, men are more likely to be attacked, primarily because of their greater body size.

“Larger persons tend to attract more mosquitoes,” the study said, “perhaps because of their greater relative heat or carbon dioxide.”

A similar effect can be seen among women. When scientists compared pregnant women with their nonpregnant counterparts in a Lancet study in 2000, they found that the pregnant women attracted twice as many mosquitoes.
The study noted that the pregnant women exhaled more carbon dioxide and had higher body temperatures, allowing mosquitoes to detect them more easily.

Strong attractant
In addition to carbon dioxide, lactic acid is strong attractant, which is why people are attacked more when they are outside and sweating, said Dr Clifford W Bassett of Allergy and Asthma Care of New York.
“Mosquitoes can sense these chemicals off the skin from up to 30 meters away,” Bassett said.

For people who react strongly to bites, he recommends insect repellent and taking a nonsedating oral antihistamine – which can lessen the itch after a bite – before spending time outdoors.
Research suggests that men are more likely to be attacked by mosquitoes than are women.
The New York Times