I mentioned this at session this past week and one thing that I mentioned is that if Asexuality is inclusive of other sexualities (such as Heterosexuality, Homosexuality, Bisexuality, ect.) or exclusive. I believe that it is inclusive since I still consider my self to be Heterosexual (in addition to Asexual), which it why I like to use the term Hetero-Asexual to describe me (since I am physically attracted to the opposite sex but not sexually attracted to anyone).