Another thing, to add to my comment above.
Being a pretty serious, collegiate athlete, I know from experience that most of the naturally cut, wiry guys such as myself, are about as flexible as piano wire. Its just, I guess, one of nature’s concessions.
I would even venture to say that, the reason why women are more flexible than men, is probably because they simply are not as “wiry” as we are. This doesn’t mean of course, that with some hard work and dedication, we can all become flexible. (Just look at Bruce Lee, the ultimate in physical prowess.) But still, its going to be a harder, longer road for those who have a natural, “tight” build.
I’ve always enjoyed rock-hard erections. I’m talking ceiling-pointers here. I don’t jelq to increase the quality of my penis, and do believe that length gains will be harder to come by if the penis becomes healthier, stronger, etc.
But finally, its important to realize that, though we may have small, minute things that separate our physical anatomies, we are, in essence the exact same. There is no such thing as an “impossible-gainer,” just like, in sports, there is no such thing as an athlete who cannot transform himself into a very pliable and healthy state of flexibility. There will always be those who are more flexible than others, however. So keep at it.