Can you test semen for the presence of HIV antibodies the way you can test blood? If not, then the simple solution is just to draw blood from donors and test it. Or alter the question so that it's about having unprotected sex or anal sex (which is statistically more likely to result in transmission). I don't think their intent is questionable, but their methods, and the assumptions behind their questions, are.
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"If ten million people believe a foolish thing, it is still a foolish thing."
- Anatole France
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