The restrictions vary from country to country, and in many cases, men are deferred even though they always have protected sex or have not had sex with men for many years.
The restrictions affect these men, and, in some cases, any female sex partners.
Research has found that men who are bisexual - and feel comfortable being out - are better in bed - and the relationship develops - more caring long-term partners and fathers.
It's a horrifying statistic, one that has galvanized to launch a weeklong series of articles, #6in10Men, illuminating what's led to the health crisis and lets its persist.
Many studies have sought to connect the aforementioned dots.
And yet, dating a man who identifies as bisexual remains a taboo.
A few taps of Google drags up countless pieces dissecting the question ‘would you date a bisexual guy?
Some groups in favor of lifting the restrictions support a waiting period after the blood is donated when the donor is considered to have had behavior considered higher risk, and before it is used, to match the blood bank's window of testing methods.