Sticking a sharpie into a girls ass with the tip pointed out. You then have sex with said girl doggy-style, and when you are done decipher what "she wrote."
While doing "anal she wrote," it looks like she drew a panda.
While having sex doggy-style with your partner, you decide to take out your laptop and use them as a stand as you browse.
I found some cool youtube videos while I was "doggy-browsing" yesterday.