An estimated 8.2 percent of Americans report that they have engaged in same-sex sexual behavior, and nearly 11 percent acknowledge at least some same-sex sexual attraction, according to its 2011 report.
Ron J. Suresha, a bisexual and senior editor of the 2006 anthology Bi Men Coming Out, said there is much variation in the bisexual community.
"People come to bisexuality from both the homosexual and heterosexual perspective," said Suresha, 52, of New Milford, Conn. "I am married to a man and primarily gay in terms of my sexual orientation, but I identify as bisexual."
Suresha said he had made out with girls in high school and still has fantasies about women, though he does not act on them. Like Kenneth, he believes he's been misunderstood by the gay community.
"So many gay men I knew were misogynistic and never understood this," he said.
"I had always felt attraction to both sexes, but primarily to other men," he said. "I was involved in gay life from a fairly early age, basically from puberty on. I was always had a very strong, not just sexual urge, but curiosity."
"But I heard from everybody as I grew up that you really can only be gay or straight -- you can't be both things."
Many like Suresha, who is a former board member of the Bisexual Resource Center of Boston, worried that there are few resources and support for bisexuals.
This new study is a step forward, he said.
In the 2005 study, participants were recruited through ads in gay and lesbian publications. But the new study relied on Craig's List ads for men who sought a "threesome" with another couple, the assumption being that they were bisexuals.
The study also required that participants had sexual experiences with at least two people of each sex and a romantic relationship that lasted at least three months with at least one of each sex.
But not all advocacy groups were happy about the study. "This unfortunately reduces sexuality and relationships to just sexual stimulation," Ellyn Ruthstrom, president of the Bisexual Resource Center in Boston, told the New York Times.
"Researchers want to fit bi attraction into a little box -- you have to be exactly the same, attracted to men and women, and you're bisexual. That's nonsense. What I love is that people express their bisexuality in so many different ways."
But Kenneth, who is writing a book on the topic, titled "I Am the Fence," believes the research validates his own experience.
At the age of 14 or 15, he said he faced sexual "confusion."
"I found myself going back and forth hanging out with gay friends, hanging out with straight friends, back and forth, but never hanging out with both at the same time," he said. "They had these hang-ups about each other."
He eventually found his own crowd. Women, he said, tend to be more accepting of his sexual orientation than men.
"I have had relationships with both men and women because for me, love doesn't have any boundaries," said Kenneth. "I am attracted more to the person than their physical identity."
Today, he and his female partner involve another man and woman in their sexual relationship.
"From the beginning, we understood that we are not to ignore our sexuality," said Kenneth. "We are in a polyamorous relationship, but we are not swingers. ... It's hard to find other bisexual people that are open and out and we can get along with."
Still, Kenneth said he cannot speak for other bisexuals, and believes many can be monogamous. As for having a preference for male or female, he said, "I prefer both -- the beauty of being bisexual is I don't have to choose."