In an effort to devise a plausible reason to excuse himself from an office-wide blood donation drive this Friday, systems specialist Brett Karns, 32, reporterdly engaged in unprotected sex with another man last weekend. 'When the nurse asks me if I've participated in any high-risk sexual activity recently, I don't want to have to lie,' said Karns, who describes himself as squeamish about needles. 'Maybe she wouldn't question my story, but better safe than sorry, right?' Karns told reporters he intends to have sex with another man next week to get out of his office's canned food drive. 