I'm sure there are gay couples out there who have been monogamous for long periods---I've just never seen one.
I know far more straight people who (I feel pretty sure) are long-term monogamous.
Some gay-themed Showtime drama a few years ago had this exchange between two gay men.
Gay Guy #1: "Do you think it is impossible for us to be monogamous because we're gay?"
Gay Guy #2: "No, it's impossible because we're
men!"
Same subject but more scientific: a survey I read about taken in the late-70s concluded that gay women had fewer sexual partners than straight women and straight men had fewer sexual partners than gay men. It noted that nearly half of gay men had bedded 100 partners and 5% claimed over 1,000.
An article in Psychology Today (I think that was the one) noted that, until fairly recently in human existence, 50% of all children born died before their 5th birthday and posited that male and female reproductive urges were shaped by that reality. Consequently, men tried to impregnate as many women as possible to insure the survival of their bloodline, while women tried to involve their men in their lives so that they would help provide for their offspring.
While not covered in the article, it was obvious to me that it did not become in the best interests of men to bond with one woman until the invention of money (which allowed for the inter-generational transfer of wealth). Even so, the majority of cultures throughout human history have been polygamous in that they allowed a man to have as many women as he could afford. In practice, most men could afford only one wife.
Personally, I like women who like sex. Too many women use sex as a bargaining tool to get non-sexual benefits (love, security, food, jewelry, etc.); to me, these women are whores and I have little use for them. My GF, in addition to being smart, pretty and her own woman,
loves sex. She had no concept of the lifestyle I introduced her to a couple years ago, but has taken to it like a duck to water.