Also, if I am to assume an upward curve is good for the G-spot (which IS NOT very deep) then surely once the tip of my penis passes that point. They've never been with a guy that had a curved penis and here I was. I had an ex-boyfriend whose penis curved upward like a banana. When we were in the. Some curve up, some down, some to one side or the other. First, let's talk about a curved down penis and Peyronies Disease (in case you have gotten a.