A 2010 study by the Center for Research on Gender & Sexuality at San Francisco State University examined the level of monogamy (or lack thereof) in male homosexual relationships in the San Francisco Bay Area.  Based on a study of 566 gay couples, lead researcher Colleen Hoff found that 47% had an open relationship, 45% were monogamous, and 8% did not agree on what they were. This is congruent with a number of other studies of male homosexuality. In the same way it is a mistake to think that all male homosexuals are promiscuous, it’s a mistake to think they all embrace the monogamous ideal of marriage.

See also:

Male homosexual relationships often lack the monogamous ideal

Same-sex marriage will likely redefine our concept of marriage

HT: Winterey Knight