i'm not posting this in my professional account of novel writing (http://www.bridget.kelly.name/professional) because it's a little too risque.
But I'd say that two essential skills for any author intending to write a fantasy novel are as follows-- at least, these are life skills I possess that are standing me in the best stead thusfar:
1) You must know how to ride a horse, and be generally familiar with equine behavior and anatomy.
2) You must know how to orally and manually pleasure a member of either sex.
So, bisexual equestrians, there's a whole world out there waiting for you!