I could see the advantages for trying to cut out STD

Just imagine having one inserted in both male and female privates.

it could be programmed to recognise who is having it off with whom.

Just think of it.
Code 1 and code 2 are married to each other. So having a bit with each other is fine.

Code 2 decides that a bit more on the side is needed. So code 2 visits code 007 and has a bit on the side.

Code 1 suddenly gets a bleep on their tracker, and she presses play.

It then says Code 2 is mating with code 007 and code 007 has got a dose of this and that. This will then be recorded for evidence using bluetooth technology on to the laptop in code onesbottom which automatically prints it out from code ones stomach, which is then given to code 2 on arrival home and read it.

Amazing :-)