I have changed the Arabic Root Word analysis page so you can see some verse context around the word. I always found it annoying that corpus.quran.com doesn't do that!
What was Mary told to guard?Farj means vagina. The translations of it in the verses you quote are just euphamisms and polite ways of stating it. But everyone who speaks Arabic knows what "farj" means.
This is the Arabic Wikipedia page for the word "farj". On the top left hand is a clickable link that says in Arabic:
"Some people may find this image unacceptable"If you click that you will be left in no doubt what "farj" means.
*Warning* graphic content. Do NOT click the link if you do not wish to see such graphic content!!http://ar.wikipedia.org/wiki/%D9%81%D8%B1%D8%AC_%28%D9%85%D8%B1%D8%A3%D8%A9%29