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It's interesting, isn't it, abaya? Our personal level of squick seems to have little to do with biological reality.
In terms of STD/HIV risk, blood and semen are completely equal. Semen may be riskier, actually, because producing it generally involves genital contact, and that can spread illnesses that aren't bloodborne. But we're way more grossed out by blood.
To nudge us back toward the OP, the other thing about fetishes is their transgressive nature. That transgression alone is attractive to some (all?) people.
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