Despite advocates on all sides of the romantic pairing spectrum, Harry Potter is a Hero’s Journey. That’s not to say that romance does not play a significant part in the series. There is one major character [highlight for spoilers] (Severus Snape) whose murky motivations are finally revealed to be the result of romantic love. This person’s near obsession led to a life of both extreme bravery and a bullying sense of resentment; it also gave us one of Rowling’s most interesting and layered characters. However, in spite of the fact that this story line crosses and twists through Harry’s and influences the hero’s journey in ways we only learn about at the bitter end, it changes nothing about Harry’s story; it just broadens his perspective.
Harry, like all teenaged boys, thinks about sex; but he has bigger things to worry about then getting into Ginny Weasley’s knickers. Even the main romantic arc of the series, the charming two-steps-forward-two-steps-back awkwardness that is Ron Weasley and Hermione Granger’s relationship, takes an understandable back seat to their best friend’s life-endangering quest and the threat of domination by an evil overlord wizard.