Forbes was co-curator for the 2007 exhibition, "Kink: Geography of the Erotic Imagination," which included a display on gainers and their natural partners, so-called "feeders."
The exhibition included artwork of weight gain fantasies, as well as examples of body inflation, rubber inflatable clothing, balloons and other fantasies.
Its creator, Katharine Gates, author of the book "Deviant Desires," says the practice of "growth" may be connected to ancient fertility cults and could be a healthy alternative to the repression of appetites and female bodies.
The gainer-feeder relationship is really a "metaphor of arousal," according to Forbes.
"Some people watch someone blow up a balloon and think it's the most erotic thing they have seen in their life," she said. "You watch a woman blow up like a balloon bigger and bigger and anticipate when it's going to blow up. It mimics the process of arousal."
Gainers rely on "feeders" to help them grow, according to Forbes, and their "kink"
"Somebody feeds you to this point where you are bigger and bigger and getting to the point where you are so large, you actually can't take care of yourself. It's a dependence and power dynamic."
Many don't even rely on contact for orgasm, rather the "idea" of body growth, she said. "It's about the mental stimulation."
"Imagination is the most potent for your sexuality," said Forbes. "Everything in the universe is a turn-on for someone."
But Robert Dunlap, a Los Angeles sexologist, and director of the Documentary Channel film, "Xaviera Hollander: the Happy Hooker," said people are always looking for the "next big fad."
Weight gain could be looked at as a "model for success in these economic times," he said. "Look at the guys on Wall Street who say, 'I can eat and play.'"
He had several clients who were "severely obese" and had no trouble with their sex lives. "They found a way of doing it just fine. Here is where size matters."
Dunlap also casts no judgment.
"My clients are amazing," he said. "I learn so much. To quote from [Albert] Kinsey, 'The only unnatural sex act is the one you can't perform.' "
But some doctors and therapists do worry about the effect weight gain will have on a gainer's health, especially in the midst of a national obesity epidemic.
Chris Reynolds, a licensed professional counselor who practices in Anchorage, Alaska, said he had two patients – a couple into gaining – who were seeking help for other reasons.
"I may feel it's alarming and concerning and need to mention it, but if it doesn't become their goal, the therapy is not about my agenda," he said.
"It wasn't disturbing to them and they didn't come in complaining," said Reynolds.
In gainers and feeders, body dysmorphia and sexual obsession are "interwined," he said. "You can't separate the two."
"We can attach our arousal template to anything we want, to shoes, to a certain shape of the face or breasts," he said. "These people are attached to a body with a lot of fat on it."
As for Git, he seems obsessed with his own body, according to his blog.
"I love how when I lean to one side, I feel a roll form around my love handle," he writes. "How my upper back is getting softer and is beginning to naturally fold over the small of my back. How all my pants' waistbands are permanently folded on the front. I love it…I want more."