Scientists do know that genetics account for a whopping 85% of our susceptibility to mosquito bites. They've also identified certain elements of our body chemistry that, when found in excess on the skin 's surface, make mosquitoes swarm closer.he short answer is yes. Mosquitoes do exhibit blood-sucking preferences, say the experts. One in 10 people are highly attractive to mosquitoes, reports Jerry Butler, PhD, professor emeritus at the University of Florida. But it's not dinner they're sucking out of you.