Sorry about the unusual title, wasn't sure how to describe the thread.

When ever i am erect, i can feel that the ridge of my shaft continues inside my body. it continues down beneath my balls and the area between balls and anus. some times when i am fully hard i notice that my penis is not as big as other times, when i push on this ridge or stroke up along it, my penis increases in size.

Im just wondering when doing PE excericses like jelqing, is any attntion paid to this ridge, even when fully erect, at its largest, pushing on this area, causes my penis to swell more, pressure on this area is also key during masturbation.

thank you for any feed back.
thanks