Penis pumping is in fact a real thing that people do to try, essentially using a vacuum to forcibly succ more blood into the pp. It is also, in fact, not safe. Pumping to any degree capable of making a noticeable difference in penis size will result in micro tears throughout the tissues of the pp, often resulting in ~reduced~ base size as scar tissue buildup reduces blood flow. As you might imagine, this scar tissue buildup also frequently results in erectile dysfunction as pp can longer naturally achieve enough blood flow to become beeg pp.