I can't believe I'm posting on here, but what the heck. I ordered up a X-40 and have been using it daily for a couple weeks along with some stretches and jelquing. I had been making steady gains until yesterday. While pumping, it felt like I put too much pressure against my groin and it made a popping noise. Maybe a vein or ligament being moved around under the skin/fat layer on the pelvic bone? Anyway, I've been a little timid since then. I'm also wondering how much my sex drive plays a part in getting a good pump. Seems like if I'm horny, I'm knocking on 170, but after "incident" I'm back down around 150-155.