“There’s an incredibly serious risk of contracting a blood-borne disease by drinking your partner’s blood. I wouldn’t recommend drinking your partner or anyone else’s blood, but if you want to do it anyway, at least seek medical assurances first that they (and you, if it’s being reciprocated!) aren’t carrying any blood-borne diseases. HIV/AIDS, Hepatitis B, Hepatitis C, malaria and syphilis are all potentially life-threatening and not fun to deal with.”
Article source: https://www.huffingtonpost.co.uk/entry/what-happens-if-you-drink-blood-megan-fox-machine-gun-kelly_uk_626bba9de4b050c90f3f173a