<unk>  or<unk>  is the medical use of probes called sounds to increase the inner diameter of the<unk> and to locate obstructions in it. Sounds are also used to stretch the<unk> in order to receive piercing.<unk>  and<unk>  play are also used to refer to this practice in a sexual context.<unk>  play can involve the introduction of either soft or rigid items into the meatus of the penis (as well as further in).  Objects such as sounds are usually only inserted into the penis to Cobb’s Curve (considered to be the "Safe Area" of the<unk>  tract) and can usually be easily retrieved.  Other toys and items, such as catheters, may be introduced deeper (in some cases even into the bladder).  Some items may even be allowed to curl several times or expand within the bladder. This action in the male may be directly or indirectly associated with stimulation of the prostate gland and some types of bladder control (BDSM).
Urethral sounding
Penile discharge
Vaginal discharge
Abnormalities in micturition
Urinary hesitancy
Increased bowel sounds
Penis pain
Scrotal swelling