poliamor

Polyamory (from Greek πολυ [poly, meaning many or several] and Latin amor [literally “love”]) is the desire, practice, or acceptance of having more than one loving, intimate relationship at a time with the full knowledge and consent of everyone involved. The term polyamory is sometimes abbreviated to poly, and is sometimes described as consensual, ethical, or responsible non-monogamy. The word is sometimes used more broadly to refer to relationships that are not sexually exclusive, though there is disagreement on how broadly it applies.
Polyamory can refer to the practice or status of a relationship at a given time, or used as a description of a lifestyle, philosophy or relationship orientation (much like gender orientation), rather than of an individual's actual relationship status at a given moment. It is an umbrella term that covers many orientations and modes of relationship. There is fluidity in its definition to accommodate the different shades of meaning which might be covered. Polyamorous relationships are themselves varied, reflecting the choices and philosophies of the individuals concerned.
Polyamory differs from polygamy, although the two are occasionally still used interchangeable because "polygamy" was the word used for all non-monogamy before "polyamory" was coined in the early 1990s. Polygamy more accurately refers to specific structures of recognized relationships, while polyamory is a personal outlook grounded in such concepts as choice, trust, equality of free will, and the more novel idea of compersion, and newer cultural traditions distinct from the religious & cultural traditions of polygamy.

em portugal:

http://poliamorpt.com.sapo.pt/