Sexual orientation is an enduring pattern of sexual attraction to persons of the opposite sex or gender, the same sex or gender, or to both sexes or more than one gender. These attractions are generally subsumed under heterosexualityhomosexuality, and bisexuality, while asexuality (the lack of sexual attraction to others) is sometimes identified as the fourth category. There are more sexual orientations, however. People may use other labels, such as pansexual or polysexual, or none at all.