I remember the Jasper Carrot sketch where he said when he was younger his dad told him a menstrual cycle was something only girls had. For years he thought it meant one without a cross bar and a shopping basket on the front.
We had a girl in our battalion who wasn't known for her cleanliness (or intelligence).
One day on camp, she went up to one of our sergeants and said 'Sergeant, can I speak to you, I've got a personal problem'
'What is it' he replied.
'Well it's, umm, it's....'
'Come on, spit it out'
'Well, me c*nt's bleeding'
At this point, after hiding his disgust, the sergeant told her to ask the other girls if they had got anything. (How this woman went to camp without any sanitary protection, I shall never know)
They hadn't, so he ripped the bandage parts of a FFD and gave her the gauze pad and told her to use that.
4 days later, I sh1t you not, she went back to the same sergeant and said
'Have you got another one of those bandage things, this one's a bit full!'
It was at this point that I think the sergeant produced diced carrots on the grass and the girls were instructed to give her a 'regimental bath'.
the same girl would be in the back of a bedford and when she wanted a piss, would take out her mug, piss in it, throw the urine out the back of the bedford and replace the mug on her water bottle - unwashed.