Sensation/Ligaments

Just confused on what this sensation I am feeling and have been feeling for years. I think it is my ligaments retracting or releasing the stress built up during my penile exercises.

For instance, say I do my routine as usual, but the next time I jerk off, afterward there is slight soreness, sometimes close to the side of my penis toward my pubic bone. The best way to describe the feeling…after a workout like jogging for instance you may be slightly sore. Because your glutes and legs etc blood flows down there to help out the muscles. But a day or two later you are either very sore or slightly sore and the muscle feels tight.

Does anyone know what I am talking about?