There are several a handful of products that claim to either relax or desensitize the anal sphincter muscle.
Adventure and Daring sprays (by Intimate Organics), Apronal Anal Spray and Mr. Ease Anal Spray (by Erotic Embrace), are made of herbs and they claim relax the muscle rather than desensitizing the area like some creams and gels do.
Lotions, creams, and sprays such as Crazy Anal Ease Gel, TitanMen Relax Lubricant, Tushy Tamer, Anal Ease, Bottoms Up, Anal Blu, Ez Access, Anal Glide, Golden Girl Anal Jelly, Rear Entry, and many other creams, desensitize the area.
There is some concern among "experts" and the medical establishment, regarding the use of desensitizing products. One of the problems with such creams is its numbing effects. Since it reduces or eliminates pain sensations. Sensations that are trying to tell you some something is wrong. May be you both are going to fast and it's cause some tearing of the anal tissue. Pain is your friend, believe it or not.
Some other things that have been said is that chemical ingredients can cause health issues if they are over used. Such as arrhythmia (irregular heartbeats) and even death.
It can cause permanent damage to nerve ends, if used to often. It can become toxic and cause poisoning with lethal consequences if used in large quantities. Don't forget that the walls of the rectum is highly absorbent.
I would suggest that if you thinking about exploring with anal play. You start by practicing with fingers and smaller objects. Mental relaxation exercises are great. Use lot's of lube and a condom. Not only for protection against STD, but it help make thing more....hmm, slippery.
Ibuprofen is a non-steroidal anti-inflammatory drug (NSAID). It works by decreasing pain through reducing inflammation but does NOT relax muscles. Muscle relaxants can only be prescribed by your doctor.
This sometimes happens when the muscles of the body relax allowing the sphincter muscle of the rectum to open, if there is fecal matter in the colon, then it can empty some of the contents. It does not always happen.
Muscles cramps occur when a muscle contracts and does not relax. This causes pain in one or sometimes multiple muscles.
Skeletal muscles .
smooth muscles
Muscles do two things: they can contract, and they can relax. They do not do anything else.
No. Muscles only pull (contract) and relax.
sympathetic stimulation causes the dilator muscle to contract and sphincter muscle to relax, as a result expanding the pupil.
The muscles constrict (tighten) and then relax to help pump the blood.
Muscles contract and relax all the time. Without more information it is impossible to help you. What reason do you need to relax it or them in the first place. What kind of muscle are you talking about.
When one muscle in a pair contracts the other expands.
When the body dies, there is a loss of muscle control. Without the muscles around the sphincter and bladder holding/contracted the bowels and bladder completely relax and are evacuated. Think about a baby who is in diapers; they have not yet learned how to control those muscles on their own so without that muscle control they just soil themselves. It is the same upon death.