Bad words

I never thought i'd run into this problem as i never intended to teach any profanities, but i found that more often than not students would mispronounce a word and would end up saying something they shouldn't. In this situation i felt that i couldn't ignore it, so i subtly corrected them whenever they said something naughty. Although sometimes they say something hilarious. A few examples below;
Intended word. Word said.
Beach. Bitch.
Virginia. Vagina.
Fork. Fuck.
Here is my favourite:
Me: what do you want to be when you grow up?
Student: a cunt. (Accountant)
Me: what does your mother do?
Student: she is a cunt. (she is an accountant)