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I've read that in some insects (fleas/mosquitos for example) blood type, lactic acid amounts and other genetic stuff plays a big part (I get shredded by fleas/midges etc - my wife is always unscathed). But in something less mobile that's just sitting on a blade of grass waiting to hook onto whatever walks past I can't see that'd be a factor.
CYOA
Yeah, I don't get this. I went a ride with a mate recently, we were both in shorts, neither of us had any repellant on, he said he found 3, me none.