TheRightToArmBears said:
I think most asexual people are just masquerading as such because it's more flattering than saying they've never had any relationships and are a virgin because no one wanted to have one with them.
Not all, of course. I'm sure there are people who feel no sexual urges at all, but I think it might be possible with enough stimulation and possibly alcohol to change all that.
Perhaps there are some who are indeed masquerading, but I doubt very few would choose to do so if they really feel sexual attraction. It is not something that can be turned off, or on for that matter, at a person's will, it just is what it is. I went through my teenage years believing I was heterosexual, but I was always nagged by the question in my head, 'is that really true', and it took me a long time and a lot of confusion to dispel a lot of beliefs and truly accept myself. I am much more content with being myself around people than ever before, because I do not have any social obligations of being sexual, something which I am not. So it was definitely freeing to find out about the existence of asexuality.
I am a hetero romantic asexual, meaning, I prefer the opposite sex for emotional relationships, with sometimes an intellectual connection as well. And yes, I have indeed been in a relationship before, and never felt any sort of sexual attraction to the one I loved, nor to anyone else for that matter (on all genders). I do understand aesthetic attraction, and I do like to be physically intimate (hugging, and cuddling, basically), but there is no intrinsic physical want or desire for sex with anyone. Arousal does happen from time to time, but it is never from any sexual desire for any person.
An important note to remember, one's behaviours are different from sexual attraction. A celibate person is one who chooses to ignore or repress their sexual desires for a person/persons, whereas being asexual means there is no sexual attraction whatsoever.
The best FAQ on asexuality, and online community for asexuals and those curious about it is here: http://www.asexuality.org