Life signs are monitored throughout the dome, in any way that applies to the species: pulse, brain activity, emissions. That is, I think, fairly standard.
As far as what is allowed... any act that involves penetration is forbidden. But -- oral sex that, for instance, does not involve any form of insertion into the mouth -- that would be permissible. It is also required that no inmates be in direct contact at the moment of orgasm; one body length of distance should be maintained to avoid trouble. In other words, you may bring a partner to orgasm without penetration, and then move away, and that would be... permissible.