Current US law bars any man who has had sex with a man -- even once since 1977 -- from donating blood.
The restrictions were established in 1983 when the AIDS epidemic was spreading quickly in the gay community, sparking widespread fear about the deadly infection, which was then poorly understood.
But now, a growing number of medical and legal experts say that the restrictions are outdated, and that sophisticated tests for human immunodeficiency virus (HIV) exist which can make blood donation by gay men a much safer practice.
An advisory committee to the Department of Health and Human Services recently recommended replacing the ban with a 12-month deferral period for men who have had sex with men in that time.
In that case, sexually active gay men would still be prohibited from donating blood, but those who have not engaged in sex with other men in the past year would be allowed to donate.
Jason Cianciotta, director of public policy at Gay Men's Health Crisis, said such steps would not eliminate the stigma or discrimination associated with the ban on gays.
"Any deferral based on a sexual orientation label -- MSM (men who have sex with men), gay or bisexual -- still perpetuates the harmful and unscientific notion that HIV is transmitted because of who you are rather than what you do."
He also described a policy requiring 12 months of abstinence as a "de facto lifetime ban" for most gay and bisexual men.
