The current proposal is to allow gay men to donate blood if they have been celibate for at least one year.
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“So the one year [deferral] is a time frame that’s not represented by science,” Donnelly says. “It’s just a number. It could’ve been six months; it could’ve been two years. It’s just something they kind of pulled out of their butt.”

http://news.yahoo.com/gay-men-could-soon-donate-blood-120500281--politics.html