Penis size, breast size, thigh size, belly size, nose size, hair length, height... what else? Size, schmize. Everyone comes in different sizes and everyone can enjoy fantastic mind blowing sex.
I'm concerned. Is the only way you make your wife cum once, or more than once, with your fucking PENIS? What about hands, tongue, lips, hell, your feet?
I cum fine from PIV but some, if not many women do not. They need fingers, tongue, a vibrator, to at least warm them up. I prefer to cum 6 or so times before we even move to old fashioned intercourse.
The worst sex I have had has been with 2 men (separately haha), one who was 12" (I'm able to measure with my eyes) and one who basically had a dick the length of my thumb. I think it qualified as a micropenis.
In both cases, these men had NO sex skills other than put penis in and thrust. God, it was boring. Yes, even the hung like a horse (or at least a burro) guy... I came 3 times, he came once. Got out of me, and 5 minutes later he was ready to go again (he was 45, so that was impressive), but then all he did was get on top and start sawing away again. Came again, stayed hard, kept on pumping. I was so glad when he had to answer his phone and needed to go back to work (it was his lunch break).
I happen to have a very deep vagina. It's funny, no women ever boast about the depth of their vajayjays. So I could accommodate this cartoon penis, iyt didn't hurt, but that didn't make it great sex. (After our 2 dates, he ended up having family issues and couldn't keep dating, or I might have worked on things with him a bit...)
The smaller gent had a Prince Albert, a large piece of jewelry, and good for him. But it made giving him a bj awful! And as I said, he made no use of his fingers and mouth. He was about 50. I would've talked to him about his lack of skills, if I'd felt invested enough otherwise, but I didn't. So, one and done.
Just my POV.
All that said, your wife gave you TMI. Is it OK with her new bf that she's sharing his dimensions with you? There's a need to be discreet when we are practicing poly, especially as newbies, and we are feeling insecure and competitive.
I didn't have much trouble hearing about Pixi's partners when I was new to full time poly life with her. Her first real bf after we met had a cartoonishly large penis. She used to stretch her face muscles on the way to his place to get her jaw ready for even a shallow bj. One time he thrust too deeply and she puked her dinner all over his lap.
Big cocks can sure be trouble. Advise your wife not to eat a full meal before sex lol.