Andy: of course asexuals are part of the LGBTQA community!
You’re not ‘straight’ if you are asexual. You’re not heterosexual which is what straight means.
Anon may be heteromantic but asexual, which does still qualify as LGBT since it’s still not heterosexual 🙂
might I add, just to be on the safe side? heterosexual aromantic people are LGBT+ as well 🙂