So I'm confused, if anything the BRAIDS not 'tails', are filled with nerves which aid in a Vulcan like mind meld, or one on one telepathy. It isn't mentioned at any point in the movie that it is only for sex (which would mean the movie depicts bestiality if taken as a sex organ). Did MNN even watch the movie?
Plus if you've read from the Saga of Seven Suns, the sex organs are as conventional as they are on humans, the nerve braids are something else. It is a pity Avatar's Na'vi are tall since this parody would make more sense as a Na'vi woman with (a) human(s).