Drinky and a few other posters here seem to be confused about anal sex between two men. This practice is not done exclusively in the "doggystyle" position, and Drinky insinuated. It can be done by one participant (the bottom) having his legs all up in the air, while the cheeseburger or dildo wielding Veronica Mars (the topper) goes in from the front. I have drawn an illistration to show this.
As you can see, it can be done.