According to a new study, yes:

A study to be released next month is offering a rare glimpse inside gay relationships and reveals that monogamy is not a central feature for many. Some gay men and lesbians argue that, as a result, they have stronger, longer-lasting and more honest relationships. And while that may sound counterintuitive, some experts say boundary-challenging gay relationships represent an evolution in marriage — one that might point the way for the survival of the institution.

New research at San Francisco State University reveals just how common open relationships are among gay men and lesbians in the Bay Area. The Gay Couples Study has followed 556 male couples for three years — about 50 percent of those surveyed have sex outside their relationships, with the knowledge and approval of their partners.

That consent is key. “With straight people, it’s called affairs or cheating,” said Colleen Hoff, the study’s principal investigator, “but with gay people it does not have such negative connotations.”

The study also found open gay couples just as happy in their relationships as pairs in sexually exclusive unions, Dr. Hoff said. A different study, published in 1985, concluded that open gay relationships actually lasted longer.

None of this is news in the gay community, but few will speak publicly about it. Of the dozen people in open relationships contacted for this column, no one would agree to use his or her full name, citing privacy concerns. They also worried that discussing the subject could undermine the legal fight for same-sex marriage.

According to the research, open relationships almost always have rules.

Check out the link for what that means.