This will sound weird, but I've noticed a handful of men with two distinctive smells: Araldite glue and beef Monster Munch. I have no idea why, but they're obviously scents my olfactory nerves detect!

As far as im aware no medication in pill form should have a direct affect on the breath. Some affect overall body odour (some anti depressants do and opiate painkillers if you take them more than a few weeks as well as diet pills). Since viagra is only taken as a single dose now and then i doubt it would have the time to get in to the system and affect the breath..

Now fake viagra (those herbal melt on tongue types) could very well be responsible

Are you sure its not just that one nasty musky smelling mothwash some clients use? The anasaeed type smell.. Dont know what brand but always hate when i smell it xx

Usually when they smell like shit it's because they are so dehydrated that the body has started re-absorbing water from their colon (and shit therein).  Doing this job when you're raw vegan is a whole new ball game!

Sour milk is a smell I notice with some older clients, I often wondered if it was something to do with alcohol but I just googled it and apparently that's caused by a high protein/low carb diet (like Atkins).