We didn't introduce laws regulating sex to prevent HIV spread. Why not?
There have, however, been prosecutions against people who have deliberately spread it - which shows that, as in most cases that generate a lot of attention and calls for new laws, existing laws already cover the matter.
About other subjects in the thread that seem to be coming up fairly frequently:
* On Eurostar masks have been compulsory for a few weeks already as it is the law in France and Belgium, but they do allow a quick removal for the purpose of eating and drinking. Their on board catering is still suspended, so it is reasonable to extrapolate that nobody is going to get in trouble for taking a quick sip of water or popping a biscuit in their mouth over here.
* I'm deaf myself, but I don't do sign language. I don't lipread either, although I do understand people better if I can see their lips, that's true. There are transparent masks available for this purpose but other deaf people tell me that those are useless as they fog up in seconds anyway. Bear in mind there is always the back up method of writing things down.
* France has just allowed SNCF to resume 100% capacity, even removing the requirement - from the 8th June - to have a boarding pass for TER services, with only the Ile de France region still having some distancing / capacity restrictions, but bearing in mind that Paris is where the infections are most concentrated still that is not a great surprise. It does, however, indicate that masks are a step towards 100% capacity on public transport - though i do agree with those who hope it is only a temporary measure.
Now a question of my own - which type of mask is easier to breathe through? The commonly seen rectangular type or the DIY type?