EvolvingFlesh - one of the things that prevents 7” girth from being “ideal” is that fact that almost no one can get that size cock in their mouth. Oral may not play a big part in your situation, but for a lot of guys it’s an important part of foreplay or, in the case of us gay guys, a mainstay of our sexual encounters.
Try this. Take a sheet of paper and make a mark seven inches from one end on the long side of the paper. Taking the top edge of the paper (short side), roll the sheet into a tube with the top edge touching the line you drew and tape it. You’ll have (in the U.S.) at tube of paper 8.5” long and approximately 2.25” in diameter (7” girth). Now try to put it in your mouth. Since your mouth is probably larger than a woman’s you can see where this might be a problem.