It isn’t possible to have an orgasm in a chastity belt/cage
False. It is very possible to have an orgasm. Depending on the cage/belt it is possible to thrust into it. It is also possible to just put a vibrator on the whole thing and achieve orgasm. Is it the best orgasm ever? No. If I had to rate orgasms on a scale from 1-10 this would be a 1. Sometimes even a zero, but it is possible
Escape is impossible
A lot of chastity devices ship with very cheap locks. Some only require very basic lockpicking skills (some only require a piece of metal to push against the locking mechanism). If your chastity sub is a brat (or a nerd) be sure to invest in better quality locks.
Also, depending on how the cage fits and how the person is shaped, it may be possible to pull the penis out of the cage entirely (and put it back in). Things like PA piercings and cages that utilize them can help.
You can lock someone up / stay locked up forever
While it is possible, there are a number of factors that limit how long one can remain locked up. First, there is the device itself. It may start to rub the wrong way or just start to get uncomfortable.
This device for example:
If I wear it too long I can start to develop bruises around my waist. It also takes several nights to learn to sleep in it.
Secondly, we have the mental component. While self-locking is a good thing, it helps to be engaged with your keyholder. Acknowledgment of wearing the cage or teasing goes a long way. If you are just wearing it to wear it, or if there is no engagement, the experience will be sub-par.
Final Thoughts
The best thing that you can do is remain engaged with your keyholder. There will be some trying times and some things that you might not even know that you need. The cage might even need to come off. For me personally, having the cage on puts me in a submissive headspace. Therefore, I can’t make many decisions, so don’t ask me to make any. I am your slave. If this has changed, remove the device or pass the key to someone else.