Make a code... Make a set of folders like a b c & d and for each set make another set of letters and do it about 4 times so she wouldn't find it. Also name the porn something she wouldn't type in search or remove the extension on the porn file... change porn.wmv into hasjhs and leave it wherever she wouldn't find it.
who cares? if your gf has a problem with you looking at porn... tell her to get over it or you'll find a new one (tell her to let you video tape her if she doesn't like you looking at other girls... guarantee you she will get over it)
I keep them to my desktop..... so that girls will come to my place again and again and actually see to it, and I can caught them red handed and make them feel hot...... but usually it happens with my neighbor girls not gf.
just place them in windows folder or any system folder or/and rename them to some other extension cbd xyz nobody could find them in some other extension u can then open vlc player and play them or rename them back to play them.
What if your gf or mother is smart enough to just search the whole drive and sort the file by size... they will pop up immediately