Bladder sounding is a type of urethral play made to stimulate the bladder. This is considered an extreme form of urethral stimulation and it is not for everyone. In fact, most people who enjoy urethral play will never want to attempt bladder sounding. At the same time, there are those who do enjoy this very intense and extreme form of urethral stimulation. Bladder sounding involves inserting a urethral toy very deep. It needs to pass the base of the penis and enter the prostate. After this, the toy goes even further, out of the prostate and into the bladder. In order to be able to do this, you need a very long urethral toy. Even more importantly, you need to be very experienced in all forms of urethral play. This is an advanced activity that only those with the most experience with urethral stimulation should attempt. Also, keep in mind that bladder sounding can often be very intense or even painful, so it is more popular among those who like to practice BDSM and other kink activities.
Those well-experienced with prostate stimulation may wish to try to go even further. It is possible to tease the entrance of the bladder. This may be enough of bladder sounding for some people. Others choose to go even further and insert the toy into the bladder itself. Again, this is possible but it is considered an extreme activity. You need to be very experienced and knowledgeable about urethral sounding in order to do this. Also, it is important to use only the long toys made for deep urethral stimulation, such as Van Buren sounds. These toys are specially made for deep urethral play and should minimize the risk of injuries during bladder sounding.