Concubine

[PussyCat]

Collection of women whose sole purpose is to act as sexual relief from your existing wife or significant other. [harem]

[Sonia]

A woman who is involved in a [monogamous] relationship with a man but is not legally married to him. An old term for a [kept woman] or [girlfriend].
She is usually a willing participant in the relationship and may be of any social status.

[Rihanna]

A woman in an ongoing [monogamous] [relationship] with a man of her own volition, regardless of economic, social, or marital status.

[Becky]

A fuck buddy

[Justin Bieber]

A sex bitch.

[Justin Bieber]

a person who is a slave for sex

[Raeanne Dimick]

A [slave] that is paid in having a home, money and whatnot.
A maid/sex toy.

[Jason Yan]

One great masterpeice by the ever popular metal-core band CONVERGE.