A person who identifies as asexual does not experience sexual attraction. They may, however, experience different kinds of attraction (romantic, aesthetic etc.). It is important to note that asexuality is not the same as abstinence or celibacy (these are choices people make regardless of their sexual attraction) - and that people who identify as asexual can and do sometimes engage in sexual activities! It also doesn't mean that someone who is asexual cannot enjoy sex, many do, they simply do not experience a sexual attraction. Furthermore, asexual people who experience attraction may be attracted to a particular gender and/or gender expression, and might also identify as heterosexual, lesbian etc.