The state of being sexually or romantically attracted to members of either sex or gender.
The state of being bisexual (“having both male and female parts or roles”).
A person who is sexually attracted solely or primarily to others of the same sex.
Sexually and/or romantically attracted to members of the same sex, such as a man who is attracted to men or a woman who is attracted to women; gay. (Typically used in the sense of sole/exclusive attraction.)
Between two people of the same sex; gay.