Hatter, asexuality is only about lack of sexual attraction. The libido of an asexual is unrelated- some have no libido at all and others have quite high libidos. We have no idea what causes asexuality, just as we have no real idea what causes homosexuality.

Lack of acceptance sucks. When I was younger I thought that because I had a romantic bias towards the same sex, I was homosexual, so I came out to my mum after a few years. Wow, you'd have thought I'd told her I got off on kicking puppies. My brother knows the truth about my asexuality and he's ok with it, but unlike when he thought I was gay he seemed to not really know how to be accepting of it and there were a few jokes that I think were meant to be "hey look at me, being all accepting" but were kinda awkward. I think it's been easiest for me because my family don't make any comments about when I'm going to get a partner and do stuff/marry/grandchildren. Probably because of my long standing depression, they might think I'm too miserable and disagreeable to be going out doing that. I'm not going to bother updating my mother. I get the feeling this would probably be even worse.