hi not sure if this has been posted, i tried searching for it and couldnt find this exact trick, its nothing special but fun ^^
first, use Iron Boot Flask to change your gender,
then use Orb of the Sin'dorei to change you to a blood elf of the opposite gender
finally use Orb of Deception which will work as normal, but, you will have changed gender too.
im a female gnome so i get turned into a male tauren , and get even bigger mounts etc
havent tested it horde side