Right now, I can commiserate with you about the feeling of inferiority, but not about 'size'. I feel the same way about my body all the time, and I can't help but occasionally get stuck on comparing my body to the OW. She was TINY. Short, petite, skinny, all of it. And I was extremely overweight. I've lost 80 pounds this past year, beginning in an unhealthy way, but morphed into a healthy change of lifestyle.
You can't change the thing that you judge yourself on, but believe me when I tell you that we are in the same boat. Even if I think I am more attractive, or 'hot', than the OW now, it doesn't change my constant insecurity about the fact that maybe he just wanted to have sex with someone more attractive and thin than me. My H has told me a thousand times over our 15 years together that it is NOT a factor, and to be honest, I still don't fully believe that - but I'm trying.
I want to assure you that what Cammile said is absolutely true. I have had a large group of girl friends my whole life, and we have talked openly about our sexual experiences, and never - NEVER - has the size of a man's penis been discussed in any real way (except to note the obsession that men have with it), and it has never, NEVER been a factor in sexual pleasure.
Women DO NOT sit around and wonder what another dick would look like, we wonder if someone else might treat us better, make us happier, love us more, honour us more, make us feel better about ourselves, make us feel more special. That's absolutely the truth. That's all I wonder about my relationship now - can I feel loved enough post affair.
Perhaps you need to discuss the fact that you saw comments from her to the AP about size? Have you ever? If she's out of the fog, maybe she can let you in on the fact that she was trying to rub his ego with those comments and keep promoting the 'specialness' they felt during the affair (that was all an illusion btw).
It's hard, but having no idea what you look like, I can tell you with certainty that your 'size' is NOT inferior. Sometimes for me, hard and fast statements like that help me to believe. So please, believe that this is true - because it is.