I think it is true but I believe it is more to do with smell. That is certainly the case with mosquitos – some people get bitten more than others and again that is due to smell.
I’m not sure what smell the mossies like (whether washed or unwashed!) but don’t think that they or midges can know what your blood tastes like before they have bitten you.
This is not a scientific observation but I can confirm that it is true in my personal experience (we call this anecdotal evidence, and take it with a large pinch of salt). My wife always gets more bites, and in fact I think she acts as bait, taking potential biters away from me.
This (from Yahoo Answers) explains some of the possible mechanisms, but I am afraid I don’t know how scientifically valid these ideas are.
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