Aha! But that's the point. You can't just say "nevermind Elros and Elrond" especially because there's many Human/Elven pairings in Middle Earth. Aragorn & Arwen leap to mind, and while Aragorn is the offspring of Elros, and Arwen the daughter of Elrond, both of Elros and Elrond's parents had human-elf pairings in their ancestry. Elwing was descended from Beren & Luthien, and Earendil's parents were the human Tuor and the elf Idril. All were love matches.
You could also count the half-elven son of Tomas and Aglaranna from Raymond Feist's Riftwar - Calis, IIRC. He's the result of a love-match. There's also Shea Ohmsford from Terry Brooks' Sword of Shannara.
Going back even further, there's half-elves in the various nordic sagas, some of the them the products of rape, and some not. Heck, before Tolkien made it mean something else, the term "halfling" usually referred to a half-elf.
By contrast, the famous half-orcs that are the results of love matches are...??
Sorry, can't think of any...
IMO, they'd be better off to introduce a race inspired by the Norse "trollborn."