I dont think I can thing that much,*it makes my head hurt* but I think it is used to deepen the bond between them and basically *mark their territory*
For example, to this day, many humans give each ther hickeys as a mark of love(love bite) but it could also be some primitive instinct that surfaces during passionate moment!
For example, to this day, many humans give each ther hickeys as a mark of love(love bite) but it could also be some primitive instinct that surfaces during passionate moment!
