Here's one to try.. I have a foreskin so one morning while holding my cock ( as usual) I noticed a hair sticking out of the end of my foreskin. I got hold of it and started pulling it.. omg what a feeling. Turns out one of my wife's long blond hairs had got wrapped around my helmet and as I pulled it the feeling of it unwrapping was really nice and gave me an instant hardon... its now something I do regularly... if you try it don't wrap it too tight 😁