Re: Underwear Threads sticking to glans of my Penis
Unless it is causing irritation, I wouldn't worry about it much. This is just something that happens. If it's getting irritated then yes, you do have a reason to dry it off before it gets stuck to fabric (tearing off the fabric the first time is the most irritating part). (You aren't diabetic, by any chance, are you? Whether you are or not, it might help to eat less sugar.)
Personally yes, I sometimes do feel like drying off the last drop of pee with a tiny piece of toilet paper. I do it mostly just as a courtesy for my partner who gives me oral sex a lot, but there are actually reasons that toilet paper could be a lot more irritating for some than the fabric of clothes. I also pull my foreskin back to pee, because I don't like the idea of urine residue getting under my foreskin. I don't know how common this is, but I would recommend doing that--if you have foreskin.
I think it sounds like a good way of getting drops of urine all over the place, but apparently most men just gently shake their penis once or twice after they're done urinating.