The Lustlock does not prevent masturbation, as you can see you have full access to the shaft. Pretty much any device with a PA piercing will block most masturbation. The key is to either buy a device that has a locking PA shackle, use a cable and a segmented PA ring, or a lock with a PA ring on the device as examples. There are a lot of devices that will work, the key is to get the piercing first, let it heal and then go for it.
I have finally found the device I needed to begin my journey in chastity. I have never been happier in my marriage to my wife, lover, soul mate and now Keyholder.