"Know" your penis
This thread aims primarily newbies: before start any PE, I extremely suggest you to explore your whole penis. Take a closer look to it’s appearance(color, birthmarks, anything), stretching the skin to see what is beneath it. Bend, squeeze, milk it, paying attention to whatever happens(the idea is to preview the results of the exercises). Try to memorize the smell(it’s unpleasant but important). Watch each event carefully, remembering this takes time. This way you will be able to distinguish between normal reactions to PE and other issues, such as STD(very important), for instance. You just have to stop the training and remember the way it was.