What is hematolagnia?

I have hematolagnia. If you want to get me started, we're going to need a knife.

hematolagnia - video

Another word for blood play. It is a fetish or kink used during intercourse ( known in the BDSM community) or used in an act of vampirism.

I heard that Stacy is into hematolagnia.

a blood fetish, or a severe infatuation with blood or anything pertain to it i.e. the heart and blood vessels

dude I have a hematolagnia like I just can't get enough blood