University sessions for donors.
"The Union Society operates independently from the university and we respect its right to make its own policy decisions."
A spokesperson for the University of Sunderland added: "The National Blood Service provides a vital service. A large number of staff and students give blood so it makes sense for them to do it at the university.
"The criterion for blood donation is set by the National Blood Service and the university has no influence as to how or why these standards are set.
"However, overall the university and many of its staff and students support the life-saving work it does."
National Union of Students Lesbian, Gay, Bisexual, Transgender officer Daf Adley said: "While the National Union of Students has always encouraged students to donate blood on their campuses, we believe it is time that the National Blood Service changed its homophobic policies and lifted its ban on gay and bisexual men from donating blood.
"Heterosexual people are not subject to this level of prejudice by a public authority, and other countries have changed their policies to allow gay and bisexual men to donate blood, sending a clear message that discrimination on the basis of sexual orientation is unacceptable."