I had the same problem with my ex-girlfriend. She hated the fact that I would download jpegs and mpegs of Patricia Ford. Here is what I did. If you have Windows then this is what you could do.
Hiding files and images:
* Select the file you want to hide
* right click the file you want hidden and select PROPERTIES
*then in the ATTRIBUTES section put a check mark in the box labelled HIDDEN and then click OK
* Next, click on START. You will get a pull-up window.
*select SETTINGS then another pull-up window opens
*select FOLDER OPTIONS then click
*You will get another pop-up window with three categories at the top (general, views, file types)
*select VIEW. Then click on the circle beside DO NOT SHOW HIDDEN FILES
*Then select APPLY, then OK
This will hide any files that you don't want her to see. If you want to view your files then click START and do the same procedure after except select VIEW ALL FILES.
To eliminate internet history:
*click on START
*select SETTINGS then a pull-up window appears
*select CONTROL PANEL and click
*select INTERNET OPTIONS
*click on DELETE FILES
*click on CLEAR HISTORY and set the number to 1 day.
This procedure should be done after you finish viewing or downloading from a site. It will eliminate everything that you have previously looked at. You can delete your cookies as well to eliminate any trace of your viewing habits; however, I would STRONGLY ADVISE AGAINST IT! Unless, you are 100% certain of which cookies belong to which sites then by all means delete the cookies. If you delete all your cookies you will not be able to get into your accounts on other sites(ie:E-bay, Amazon, TERB, Hotmail). Instead block certain sites from giving you cookies.
To block cookies:
*next select PRIVACY at the top of the pop-up window and click
*drag the block on the meter to HIGH or BLOCK ALL COOKIES
*click on APPLY and then click OK
This eliminates the chance that those sites can read your personal data. This procedure only has to be done once.
I suggest that you create a folder and put all your downloaded files in there and then hide it. If your significant other is a computer expert then you will get caught. However, if she is a novice or semi-literate then you shouldn't have a problem. If you want more ideas like hiding files in your Windows system files or creating huge sub-directories to hide your files PM me.