Dhampirs are half-Moroi and half-human. They are trained to be Guardians of the Moroi against the Strigoi.
Dhampirs were originally born through the union of a Moroi and a human in the years before the Dark Ages. Through this union created a half-vampire and half-human. Today, they are born through a Moroi (male/female) and another Dhampir (male/female). Usually female Dhampir and male moroi.
Dhampirs are mostly with a Moroi causing the births of more Dhampirs. A romantic relationship between a Moroi and a Dhampir during their teenage years is seen as normal. As adults though the relationship is frowned upon, leading to the Moroi abandoning a Dhampir and going off to marry another Moroi. The romantic relationship between two Dhampirs is heavily frowned upon, as they are seen as a disgrace as they cannot have children and that they are abandoneding their causes to protect the Moroi. One Dhampir romantic relationship is seen but they continue to be Guardians, that being of Rosemarie Hathaway and Dimitri Belikov, though their relationship is degraded and frowned upon. The romantic relationship between a Dhampir and human hasn't been seen so far, but it is considered a to be taboo and frowned upon as well.
The term of "Blood Whore" is seen to be given to those Dhampir (male/female) who give their blood to a Moroi when they have sex, though it has been seen to be given to those Dhampir women who want to raise their children not to continue to be Guardians.