[corin_]

I might be misunderstanding a valid criticism, but your complaint is about the parent comment's using "are" rather than "is"?

That's simply the plural version: if one person is asexual, multiple people are asexual.

[Zardoz84]

I was trying to point that a person can't become asexual (on the same way that no body can change is sexual orientation). Asexuals are born asexuals. Like a homosexual is born homosexual, etc.

[pharmakom]

I don't think this is true. People's sexual orientation can shift over time, and that might be to being asexual.