I've always had issues with how a certain word can be consided obscene,
while another word which means the exact same thing is considered acceptable.
Most times, it's just due to an accident of history, and it makes no sense to
me at all.

Why, then, did I blush for the Singapore newscasters the other day when,
while introducing a story about the tenth anniversary of Viagra being
available in Singapore, they put up a graphic reading "Helping Singaporean
men get it up for ten years"? And then, a second later, when the reporter
started the story with "Are you hard up without a hard on?"