Wikipedia says: A prude (Old French prude meaning honourable woman)[1] is a person who is described as (or would describe themselves as) being concerned with decorum or propriety, significantly in excess of normal prevailing standards. They may be perceived as being more uncomfortable than most with sexuality or nudity.
Well I am not bothered by nudity.. don't parade my body now as it is rather Bagpuss like now! But I do walk to and fro the bathroom and if my brother is out would go to the spare room where the ironing pile is to retrieve clothes! Happy to be nakey-spakey in shower/changing room at pool with DGCs..think it sets a sort of example about 'all bodies are normal' 
But I am prudish about public sex/snogging! I do not mind a greeting kiss or a goodbye kiss & hug etc but almost eating one another & groping in the street, on a train etc. is unnecessary!
Issues about beer bellies, tattoos, mutton dressed as lamb, old goats dressed as kids, inappropriate clothing on children etc I may not like but don't think that is prudish just a matter of my personal likes /dislikes!