Kaizmuth

Don't mean to sound like an asshole, but you could probably gain another visible inch or two if you lost weight. Stored fat in your upper pubic area makes bulges around the shaft of your dick and makes it look smaller. Also limits your penetration.

It's good that you found a woman who accepts and loves you for who you are though. That's hard enough to find without any limitations. Good for you.

I have two friends who both used to weigh well over 300 lbs. One had gastric bypass, the other just ate less and exercised a LOT more. Both got down to reasonable weights. The one with the bypass has a hard time keep the weight off. The one who exercises has no trouble because it was a lifestyle change, not a quick fix.

Yes, bypass surgery will be fairly quick, and easy. Getting off the couch and moving, and eating less, will be harder, but you'll be much happier with yourself.