I and my wife use the iPad all the time.
My Solution? Download an app called Savy Soda. (It's an 'in Private' browsing app and its free)
I hide the Savy Soda desktop icon in somewhere innocent like a 'Golf Courses' folder.
Do ALL your naughty browsing by signing into Savy Soda first....
I include in this browsing : UKP, AW, email, Twitter.....oh, and any Porn, anything you don't want a trace of.
As soon as you escape (press the button to escape), EVERYTHING goes and all history is lost.
I can literally be browsing AW one second, escape, and be looking at something innocent on Safari the next....
Now, it may well be that by searching the machine at an in depth IT level you can find stuff, but for basic secrecy, it is good as my wife is not an IT professional and I have never been able to find any trace of where I have been. Maybe an IT whizz on here can tell me I am wrong?
It (so far...fingers crossed) works for me.......my near miss came recently (see earlier post) when I failed to overwrite a dodgy cut and paste I had done. Schoolboy error and carelessness on my part.