Urethral sounding and urethral play are also used to refer to this practice in a sexual context.
Urethral 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 urethral 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.
If not conducted carefully, sounding carries a risk of irritation, tearing of the urethra, or of urinary tract infection. Infections may become serious if they progress to the bladder or kidneys, and should be referred to a doctor.