Ahhh, you've added another piece to the puzzle. You've started several threads on this topic, but I don't recall if you ever mentioned you were overweight.
Losing weight, depending on how much you have, will increase the length of how much of your penis is exposed. It won't increase actual penis size, just how much is seen. Severely overweight men may actually have their entire penis hidden. The pad of fat in your pubic area would determine how much of your penis is hidden and an approximation of what you could gain from losing weight. What's even better though, is you'd be gaining health.
So, if you're 5" now (which is average and sufficient for it's purposes) you could gain a little. Don't get too exited though. I don't know how overweight you are and there will always be some fat in the pubic area.
I'm not sure what you mean by saying your other threads haven't gotten responses though. You've started several threads, and gotten several answers. We're not miracle workers and we cannot give you a bigger penis. Have you tried any enlargement methods? I'd warn to look at the dangers first, but many men have supposedly increased their size, evidenced by participation in enlargement forums.
Also, with the number of threads you've started and some of the things you've said it sounds like your problem is your self confidence. If you can't increase your penis size, than maybe you'll need to change what you're trying to fix. I know I wrote a very large response to your last thread. What did you think about the things mentioned? (I understand this is a different thread with different questions, so to keep it on topic you can answer in the other thread if you want.)