Polyamorous:is the practice, desire, or acceptance of having more than one intimate relationship at a time with the knowledge and consent of everyone involved.

http://en.wikipedia.org/wiki/Polyamorous

Polyamory (from Greek πολύ [poly, meaning many or several] and Latin amor [love]) is the practice, desire, or acceptance of having more than one intimate relationship at a time with the knowledge and consent of everyone involved.

Polyamory, often abbreviated to poly, is sometimes described as consensual, ethical, or responsible non-monogamy. The word is occasionally used more broadly to refer to any sexual or romantic relationships that are not sexually exclusive, though there is disagreement on how broadly it applies; an emphasis on ethics, honesty, and transparency all around is widely regarded as the crucial defining characteristic.

"Polyamorous" can refer to the nature of a relationship at a given time, or be used as a description of a philosophy or relationship orientation (much like gender orientation), rather than a person's actual relationship status at a given moment. It is an umbrella term that covers various forms of multiple relationships; polyamorous arrangements are varied, reflecting the choices and philosophies of the individuals involved.

Polyamory differs from polygamy meaning to have multiple spouses. Traditional polygamy is usually patriarchal and polygynous (though there are also traditional polyandrous societies which may be matriarchal) and may be practised in accordance with religious beliefs. Polyamory, on the other hand, is a different outlook grounded in such concepts as: gender equality, self-determination, free choice for all involved, mutual trust, equal respect among partners, the intrinsic value of love, the ideal of compersion, and other mostly secular ideals. As of July 2009, there were estimated to be more than 500,000 polyamorous relationships in the United States.