It is worth noting…

Shhh… maybe She doesn’t know about this.

It’s worth noting in passing that the volume of semen produced by a man is roughly proportional to the length of time it has been since he last came, at least until his balls are full again. If you’re collecting his emissions in order to have him recycle them, or simply to avoid making a mess, you’ll soon get an idea of how much sperm your husband produces after a certain period in chastity, something that should remain reasonably constant over time. Should he suddenly produce a lot less, the chances are he’s been able to slip out of his device as discussed in the previous chapter and come without either your knowledge or permission. Such a decrease in volume is a dead give-away, and one that he cannot deny – be sure to have him explain its occurrence, and take appropriate steps to ensure his chastity device is genuinely secure.

Source: http://brassiered.com/tamingthecagedbeast/interest.html