How much force does normal Aneros use exert on prostate?

Using Aneros requires certain habilities that, most probably, are not well developed when you start to use it.

Once you start using it, you feel parts of your body you weren't used to feel, so you don't have the neural connections to register those stimuli. At first you may force things way too much, exherting too much pressure on your prostate, but without you noticing.
I'm just guessing here, but maybe it's referring to how successfull you are during a session. If you overload your prostate with too much stimulation at first, it may desensitize it, making any further attempt, until your prostate recovers, futile. I'm guessing again, but I think it could severly harm you, though it's very unlikely. Most likely it will recover over time. But in general I think that advice is oriented to how successfull a session can be. Once properly stimulated, any excess pressure feels too good. But if you start with excessive pressure you'll just harm it for a while. Think of rubbing your skin for too long until it goes numb, the same happens with the prostate, only that it's much more sensitive, but you don't know how to recognize that sensitivity. A rookie mistake is to force things even more...

Anyway, after a year and a couple of months, I haven't harmed myself in any serious way. In fact when I used too much pressure I didn't notice. Now I am able to feel the prostate the way it should be felt and stimulated. It requires very little movement. Maybe because once things get going it swells up, it can resist a little harsher stimulation.

I only own the Helix, and it's awesome, not a bad choice.

The Aneros device was designed to provide a gentle massage of the prostate using the anal and PC muscles. These muscles tend to be kinda weak since they are not usually subjected to any kind of workout. Taking anything including an Aneros device and repeatedly jabbing or pressing on the prostate manually with your hand is probably too much pressure and could cause some damage or soreness.

libertinelife,

'ineverknew' is quite correct in his response. @JMay, perhaps I could have written that paragraph in the WIKI a little more clearly so I'll try to rectify that right now.

The internal organs and their respective connective tissues are much more delicate and susceptible to injury than the bones and muscles of the body's structural system or the tough envelope of skin which encloses it all. Any time you penetrate that envelope you need to use special care and gentle treatment to avoid injury. Our body's evolved with musculature adapted to supplying food and shelter on a macro scale of force, our internal organs are not evolved to deal with this level of force. However, the internal organs do respond to and make use of specific sets of muscles evolved to help those organs perform their functions (i.e. the diaphragm muscles aid breathing, the PC muscles control bladder output, the anal sphincters control excretory function, etc.) but the relative strength of these muscles as compared to the leveraged force of leg and arm muscles is markedly different.
The manufacturer recommends against use of their products manually! Manually means manipulation of the massager via the user's or a partner's own hand, this would also apply to any massager movement caused by bumping into , sitting upon, pressing upon or against another person or object.

One may read stories on the internet where prostate "milking" is discussed and wherein Aneros massagers or other devices are recommended to accomplish this. Prostate "milking" carries a higher risk of injury than simple prostate massage as "milking'" involves applying sufficient pressure on the seminal vesicles and prostate to force seminal fluid past the ejaculatory ducts and out through the urethra. While the individual "milking" his own prostate with his own finger can probably determine/feel quite readily the requisite pressure, a partner or himself will not have the advantage of that sensory feedback when using an inanimate object like a dildo or an Aneros massager. It is all too easy to apply enough force through manual manipulation of these inanimate objects to cause bruising, tearing or rupture of delicate internal tissues. Hence, when performing "milking" (whether solo or with a partner) utmost caution is required to avoid injury.If one is using the Aneros in the way the manufacturer recommends, I would think that the user still doesn't know how much force their exerting on the prostate. In reading over some of the conversations in the Aneros forum, it would appear to me that the "twitching" and convulsive feelings some users report when they're having the "Super-O" could cause much more force to be exerted on the prostate than if one were using it simply as a milking device, thus causing the same (or more) potential harm.The Aneros massagers are designed and intended to be manipulated ONLY by the user's own anal sphincter and pelvic floor muscles, NOTHING else. The internal organs are well adapted to accommodating the forces these muscle groups are capable of providing, even during the occurence of strong orgasmic spasms. An Aneros, in situ, responding only to the force these muscles are normally capable of, will merely transfer that force to the surrounding tissues. No more force than is normally available is applied. When so employed it is nearly impossible for the user to exert enough force to cause any internal injury. Furthermore it is most likely the user would first experience some pain sensations prior to any injury occurring, hence the admonition to cease use if you experience pain of any kind.

I hope that alleviates any confusion you may have had.
Good Vibes to You !