@stump,
Listen, as someone who's endowed with a bit of a baby carrot (lol), you have to accept that unless you want to endure a painful and potentially dangerous surgery, you're not getting any bigger.
And contrary to other answers here, it's ok that you followed your curiosity and watched it. The question is what do you do now?
I would say brush it off, and just be attentive to your wife sexually. I've had they best sexual partnerships when there is open and honest communication about likes and dislikes. And I mean radical communication. Like even during the throes of it, ask her what feels good and what you could do better. She may be shy at first, but that kind of genuine curiosity and communication will do wonders for your sex life.
Good luck