And here’s the failure to communicate that most concerns me… this isn’t HIV, it’s got multiple routes for infection and covering one with a condom does nothing to stop you catching it via another route.
Money pox can be transmitted via infected bodily fluids, via via contact with the blisters/lesions/“rash” that forms, via inhaling droplets of infected fluids (simplest example, heavy breathing + sweaty bodies very close together), and potentially any method where infected fluids from one body come into contact with the mucous membranes of another person, so that’s the eyes, nose, mouth, etc. Also it can contaminate surfaces so there’s a risk of infection via contaminated bedding. Only one of these is mitigated by a condom.
Effectively the only preventative options are vaccinations and avoiding exposure via the normal ways, trying to not come into contact with anyone infected (the “avoiding high risk behaviour” option) and by wearing personal protective equipment such as disposable gowns, gloves, masks... which is basically all the sort of things medical staff do to prevent the spread of all sorts of diseases around hospitals, but its a whole list of stuff you need to do and remember to do right, to the point where medical staff need training and spot checking to ensure they do it right all the time... understandably its not something the public is very well equiped to do.
Oh and it’s infectious before it’s “obvious that you have monkeypox” since the first early few days the various skin symptoms could be mistaken for a zit or pimple or other skin reaction and don’t necessarily start somewhere you regularly look at, such as behind the ear.
The wikipedia article is actually pretty informative https://en.wikipedia.org/wiki/Monkeypox other than not having a clear idea yet what's different about the new strain spreading around, we actually know quite a bit about monkeypox since its endemic to certain African animals there has been cases to study for decades, and the fact its related to the much more deadly Smallpox virus (the Smallpox vaccine is apparently 85% effective against Monkeypox) means its been an interesting virus for researchers to study, basically since we started trying to wipe out smallpox decades ago.
Edit: Missed a key point. The extra trouble is they need to "thread the needle" with their messaging to ensure what they are saying isn't misinterpreted as pointing the finger at the MSM (men who have sex with men) since they have mountains of evidence on how badly handled everything was with HIV/AIDS. They don't want the regular public assuming this is a disease only gay people can get, because its not, but the kinds of activities that are most likely to cause you to catch it are most commonly associated with gay men, which is sort of at odds with their first goal.