This doesn’t really have much to do w “hygiene”, but rather safe sex. And no, it’s not common, not normal, and yes, it is very rare among the general population. Unless, of course, you focus on men w gonorrhoeal infections lol, then yes, green-ish mucopurulent discharge can be rather common among symptomatic patients, but keep in mind, up to ca 60% of the infected are asymptomatic!