Sorry to be the bearer of bad news, buddy, but the problem isn't your wife's cunt. It's your tiny micro-dick. My dick is of average length and girth and last time I fucked your wife her pussy felt quite snug. All she could talk about after she came multiple times was how wonderful it was to actually feel a cock inside her when she fucked. She said fucking her husband was like fucking the handle of her toothbrush.
Sorry, man. Don't shoot the messenger. Just trying to help.