Hmm, I just had to skim through all the replies here which took some time. Looks like you definitely touched some people in some way.
Anyhow, it was sort of a waste. I see mostly just 1-liner jokes & giggles, with nothing really to contribute at all to the original poster, so I’ll take a shot here.
First of all, I haven’t had a novel published yet, nor am I a fantasy fan, nor am I familiar with bestiality, though I thought it was spelt as beastiality so looks like I did learn one new thing! I will admit though walking past the ‘Chicks with Dicks’ magazines at the local news-stands, some of the models do look damn attractive, so does that make me gay? Good question! But on to the story…
You said your character is mostly human except for a few features. Well I fail to see how just a phew physical things such has hooves can totally change a person’s sexual preference. You ARE going to have to add in other explanations somewhere to make it believable. I could be wrong, but shouldn’t pheromones and other items be thrown in? Again, I’m not familiar with horse mating rituals, etc.
Now, getting too descriptive/graphic may not be the best thing. However if it’s fantasy, I think you can get away with this concept. I highly doubt you’re the first one to come up with this. In fact, just about everything has been done before. However, I suspect a lot of the young readers will joke & kid around about the book, just look at the reaction this thread has given. That’s ok if you add humor in it, but if you try to write this in a sincere and serious style, you may not be too happy with how people comment afterwards.
Anyhow, that being said if you were to market this pitch in Asia you’d probably have no problem. I bought a science fiction novel a few years ago which was one of Asia’s best sellers. It had won some big awards so I figured what the hell, I’ll read it. Turns out that two of the characters were lesbians and I remember a scene in detail of them having sex with a male monkey. At the time I was thinking wow, they really ARE thinking about the future in this. I wasn’t offended, just surprised, and went on to the next book after I was done without thinking much about it.
But now that I think about it, the only reason that scene probably was left in there was the American translators didn’t feel obliged to edit it out. But lets take another look at American culture. A lot of what writers can do resolves around how the society believes. For example, no one cares if say, you write about lesbian or gay protagonist couples anymore. Amazon is full of them. But spin back 50 years ago, and you’d have gotten such a horrific outlash. Why such a change? Probably because in the 70’s the government forced the psychologists to no longer lable being gay as a mental disorder. Now for all tenses & purposes it’s supposed to be NORMAL (in a certain way of course).
This NORMAL theme has been brought in and out of society and heavily debated since well before Roman times. In fact, Bestiality was even accepted in past history, as well as many other things such as adult males of age 50 marrying 11 year olds & having sex. That’s right, statutory rape is a relatively new law, don’t make any mistake about it.