SRV524.....
Here's my thought and it's just that....a thought.
--I really WOULD like to help you somehow, here.
My experience with PE (natural exercises, jelq, extenders, pumping, etc.) DID alter my curvature.
But then...my original curve was slighthly "upward".
Having gone through all the various regimens and noting how my member responded (over time) I conclude it's probably easier to change an upward curve than a more downward curve from PE. Sorry, but that's how I feel is really the case. btw---my "correction" resulted in a more "straightened-out" look and slightly downward....so there you go. From what happened to me...I (think) I know of what I speak!
Now---with all that said however, I think vacuum pumping at a very low pressure setting and done every other day or so for a long duration of time....(i.e. 15 to finally thirty minute sessions say four days a week) could help you a little bit. But, I can't see the other forms of PE (jelq and exercises) contributing positively to your situation. I also think an extender device might also not produce desireable results in the particular direction you want to correct yours. I just sense here that any other form of PE (except pumping in well-defined moderation) won't produce good results to straighten your penis all that much. ...might even worsen it!
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Keep in mind you're not the only man with a downward curve. Curvature makes men unique and some would even find curving to be quite a turn-on from what I read.
Heck....the guys "toting big" even have theirs "drooping downward" anyway, so think of yourself already being in prime company!
Getting into the habit of grasping your shaft in particular ways to "guide it" and over time learning to maneuver it (upon entry, etc.) will become a regular pattern of behavior which might perhaps take away from the worry, frustration, and self-conciousness of having your particular curvature direction. In other words, like many of the rest of us....it's all a matter of learning to live with (and use and appreciate!) what you have and feel good about it all the way. Think of the reaction of your partner in seeing that you have so much to handle that it takes certain "skills" to guide, use it, and make it behave!
' Hope this helps....somewhat.