Most people, even guys, know very little about male orgasm control. This lack of knowledge is a handicap when approaching chastity. There are myths about men and male orgasm control that relate strongly to this:

if you don't watch them.
Erection is a sign of sexual arousal. However, a man can be highly aroused and even ejaculate without erection. Preventing erection does not necessarily make ejaculation impossible. In fact, with male orgasm control, if relief is withheld long enough, most men will ejaculate in their sleep even if erection is not possible.
The key to male orgasm control is to understand that absolute, long-term control isn't practical. It also isn't much fun except for the guy who wants to live that fantasy. If arousal is withheld, interest in sex will decline in a man. If interest goes down, there is little point in continuing chastity play since he has no interest. The key to the fun is that he knows you control his sex, making male orgasm control great fun. If as a keyholder, you work on a routine that guarantees his interest and provides relief often enough to prevent him from finding another way, you are on your way to big fun.
None of the chastity belts are safe for long-term wear unless regular inspections are made for irritation or other problems. As discussed in the article, there are ways to do this as a form of fun play incorporating male orgasm control that eventually results in a permanent exchange of power.
The myths about arousal and male orgasm control are incredible. In your reporter's opinion, male orgasm control works best if the keyholder makes a concerted effort to keep her partner as aroused as possible as often as possible. You don't miss what you can't get. Constant reminders work wonders on behavior. Men will not go blind, nor will their balls swell and suffer if they don't ejaculate. That being said, it is healthier for a man to ejaculate regularly. You, as keyholder decide what that means.
What About Cocks?
The penis itself is a fairly complex organ. It is extremely strong and resilient to pressure,
hitting, squeezing, etc. when soft. There is spongy tissue inside the penis on either side
that gets flooded with blood and causes an erection.
An erect penis is much more delicate. Accidental bending of an erection can result in permanent damage and a trip to the hospital. Skin is healthiest when dry and clean. Some chastity belts designed for male orgasm control make it hard for the penis to escape a permanent bath in urine. None of the devices we recommend have this problem, but virtually all devices cause the shaft to be wet by urine. This urine will evaporate eventually, usually leaving an unpleasant scent. No matter how tempting it is to use lube to ease inserting the penis into the device, don't do it! The lube will stay and actually make it harder for urine and other liquids to evaporate.