1) Androgyny 2) Certain flexible attraction 3) Gender 4) Hermaphroditism 5) Sexuality 1) Androgyny 
Bisexuality is romantic attraction, sexual attraction or sexual behavior toward both males and females, and may also encompass romantic or sexual attraction to people of any gender identity or to a person irrespective of that person`s biological sex or gender, which is sometimes termed pansexuality. The term bisexuality is mainly used in the cont....
in biology, the condition of an organism capable of producing both male and female gametes (sex cells). In plants and microorganisms, this is often ...in human sexuality, sexual interest in and attraction to members of one`s own and the opposite sex. A bisexual is thus a person with both ... [1 related articles]
Sexual attraction or relationship between members of the same and opposite sex. ... (12 Dec 1998) ... 
(bi-sek″shoo-al´ĭ-te) true hermaphroditism; the condition of having gonads of both sexes. sexual attraction to persons of both sexes; exhibition of both homosexual and heterosexual behavior. existence of the psychological qualities of both sexes, both masculinity and femininity, in the s...
[n] - sexual activity with both men and women
sexual interest in members of both sexes 
noun sexual activity with both men and women