1) Physiological property 2) Sexlessness 3) Sexual orientation 1) Sexlessness 
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% in the British popu...
[n] - having no evident sex or sex organs
sexlessness noun having no evident sex or sex organs