I borrowed my sons computer how do i erase my history so he can't see what i am researching?

Give her a break. Most likely she's a busy mom and couldn't care less about porn. Did u ever stop to think that she has an issue, even regarding her son, that she's looking for help/answers to. If you use Internet Explorer, on the left side of screen there should be a Favorites. Click on that. Look for "History." There you should see "Today" or whatever day. Click on that. THen you can Right click and delete the entries you choose. Also, up top in your browser window, where it's all white, there should be a drop down arrow, and your history shows in there, too. If you hover over an entry, you should see a red X to delete from there as well.

Most browsers have "anonymous" or private browsing. You should have started that BEFORE you surfed around. When the private browsing is ended, it clears stuff up. But most browsers have a way of deleting selective history. But this is not %100, it could still be in cache or cookie evidence stored. If you clear all cache, that would be good. This is all browser specific, tell us which browser you are using.

I find it disturbing and repulsive that you feel the need to hide from your son what you do on the internet.