I'm faceless on this site, but I'm willing to share face pictures privately. I know some people here think anyone who isn't open about their membership here might be "fake" or "on the fence", but for me, it's just a matter of comfort with how much people can accidentally find out about me and my preferences.
As a straight mutual gainer, here are things people could say about me, and how I would feel if they came to light.
One the feeder side of things, people could say the following things.
"His girlfriend is fat."
"He likes that she is fat."
"He likes her at her fatter size, than her previous thinner size."
"He wants her to get fatter."
"He is helping to make her fatter."
"He hand fed her an entire cake and a gallon of weight gain shake before bed last night, then they had wild sex."
...as you can see, statements start out tame here, but can quickly escalate to awkward and embarrassing. Most people here wouldn't be embarrassed to date a fat person (I hope!), and most would be happy to even bring their significant other a little extra food and maybe give their belly an loving pat without a second thought. Some other things are best left to the bedroom though. Or at least to a private booth in a restaurant.
On the feedee side of things, it's kind of the same deal.
"He has a big appetite."
"He's gained a little weight."
"He's gotten fat."
"He likes being fat."
"He got fat on purpose, and is trying to get fatter."
"His girlfriend is trying to fatten him up, and he's loving it."
"Every night, his girlfriend feeds him a dozen donuts, then a gallon of weight gain shake through a funnel."
When does it stop being comfortable for you?
10 years