Asexuality (or nonsexuality) is the lack of sexual attraction to anyone or low or absent interest in sexual activity. It may be considered the lack of a sexual orientation, or one of the four variations thereof, alongside heterosexuality, homosexuality, and bisexuality. A study in 2004 placed the prevalence of asexuality at 1%.
Asexuality is distinct from abstention from sexual activity and from celibacy, which are behavioral and generally motivated by factors such as an individual's personal or religious beliefs; sexual orientation, unlike sexual behavior, is believed to be "enduring".
Some asexual people do engage in sexual activity despite lacking a
desire for sex or sexual attraction, due to a variety of reasons, such
as a desire to please romantic partners or a desire to have children.
Acceptance of asexuality as a sexual orientation and field of scientific research is still relatively new, as a growing body of research from both sociological and psychological perspectives has begun to develop. While some researchers assert that asexuality is a sexual orientation, other researchers disagree.
I also made a blog page with a few more links I found on this subject.