This system monitors every inmate's lifesigns for a variety of reasons, including safety. It is fairly simple to identify when fluctuations in lifesigns indicate that someone is sexually aroused... and then if two inmates are in close vicinity when one or both is experiencing orgasm, the assumption is usually made that they are engaging in sexual activity.
[there's a few loopholes and details here that you can get if you ask, but Sentience is a little shy of them and presents the facts as quickly and simply as possible]
I will [edit the daypost] be able to retrieve those for you within the day and have them tomorrow. Is that acceptable?