Well, I have given blood many times and if memory serves me correctly, it is only men who have had sex with other men who are excluded. I don't remember seeing anything about 'women who have had sex with women'. There are of course specific statements that have to do with prostitution, drugs etc.
What is gay about this list of diseases found with extraordinary frequency among male homosexual practitioners as a result of anal intercourse is alarming:
Anal Cancer
Chlamydia trachomatis
Cryptosporidium
Giardia lamblia
Herpes simplex virus
Human immunodeficiency virus
Human papilloma virus
Isospora belli
Microsporidia
Gonorrhea
Viral hepatitis types B & C
Syphilis