I doubt cell recombination with neurons
Sorry for the serious tone in my review, trying to defend nature on film.
They probably could have intimate fun that way, but really? Would the hair suffice for genetic exchange? It is clear that the Na'vi have DNA and thus use quite large molecules as information carriers. So, a really good flash that in one way could have benefited from a female voice actor.
Ahkahk: If you are for real, there's a LOT of better ways to change your life. Also, how could a parody change how anyone feels about the movie? People aren't that easily swayed.
Remember, procreating is the prime goal for any living cell. If you are a eukaryote, it comes with the job as an organism to try to mate. Love would then be a collective term for the states of chemical levels in humans (or any being if you bend like that) that encourage getting the most fit offspring. We are certainly feeling stuff we do, because it makes our offspring better than others' in some way. Millions of years of selection deemed recombination (mating) a good way to escape Müller's ratchet (look it up) and thus we fall in love (and want to mate) with specimens that would give us the best offspring. Love is wonderful since it is thus scientifically the meaning of life. Never think easy of it, and always trust your feelings.
By the way, I really liked the six limb paradigm in the film. They kept it quite consequent together with the linking stuff. Actually, I'm most surprised the na'vi lost one pair along the way. One can't help as to wonder why...