You don't stick his penis up your urethra during frotting. You wrap your foreskin around it.
You can not safely stretch tires.
The urethra can be subject to narrowing. The stretch methods are to assure the passage stays open and allows for urine to pass through.
It is just rubbing against each other without penetration.
It sets the speed at which Highway Safety Engineers determine can be driven safely on that stretch of roadway.
When the bladder is full of urine, stretch receptors in the bladder wall trigger the 'need to go' reflex. The detrusor muscle that surrounds the bladder contracts. The internal urethral sphincter relaxes, allowing for urine to pass out of the bladder into the urethra. Both of these reactions are involuntary. The external urethral sphincter is voluntary. It must be relaxed for urine to flow through the urethra and outside the body.
To stretch a coil spring effectively and safely, follow these steps: Use a spring compressor tool to safely compress the spring before stretching it. Slowly and evenly apply pressure to the spring to stretch it to the desired length. Make sure to wear safety goggles and gloves to protect yourself from any potential accidents. Check the spring for any signs of damage or wear before and after stretching. Always follow the manufacturer's guidelines for stretching the specific type of coil spring you are working with.
the urethra
The prostatic or membranous urethra
To safely stretch a rubber band without it breaking, gradually increase the tension by pulling it slowly and evenly. Avoid sudden or jerky movements that can cause the rubber band to snap. Additionally, make sure the rubber band is not old or worn out, as this can increase the likelihood of it breaking.
Dilating the urethra is done when there is a stricture (abnormal narrowing) of the urethra in order to make the urethra wider.
The urethra.
The ejaculatory duct opens into the prostatic part of the urethra, specifically where the prostatic urethra meets with the membranous urethra. This junction is located within the prostate gland.