Canadian Blood Services has a clause that states that if a man has had sexual contact with another man since 1977, he cannot donate blood. The only way a homosexual, or bisexual man can donate blood, is by abstaining from sex for a term no less than 5 years. CBS believes that homosexual males are at a higher risk of carrying a blood-born STI/STD. All blood, doesn't matter where it comes from, is screaned before it is given to a person in need. So why does the CBS feel the need to safe-guard the public from diseases that are communicable right across the board for hetero and homosexual beings, alike.