Thank you everyone for your replies.

I can definitely see why LGBT may not want asexuality in there, simply because many don't consider it a sexuality at all...and some don't believe it exists. Yes, some people are probably asexual due to abuse in the past. For me though, I am just not interested in sexual activity with another person. I DO masturbate, it feels good and is a great stress reliever. I am not "broken" down there by any means. Many people would be shocked to find out that quite a few asexuals do masturbate! And there's nothing wrong with that.

Also, there are two types of asexuals: aromantic and romantic. Aromantics don't desire romantic relationships OR sexual relationships. Romantics may desire a romantic relationship, without the sexual activity.

I don't see any reason why we can't be included. Asexuality may not be as common as other sexualities, but it certainly DOES exist, and I believe for the majority it is not a choice. Exclusion of the not so common sexualities, including asexuality, would defeat one of the main purposes of LGBT - acceptance. At least, that's my thinking on the subject.