Licking ass is the surest way to get it in. Actually, it's downright necessary. Lube that puckered sphincter with some saliva and it'll be primed for docking. Keep a few things in mind, though. You're fooling around with something that's generally exit only. Human waste comes out of there. So before you go town and start tonguing that sweet rectum, make sure she takes the time to wash it up. At the very least apply some hot soap and water to it and rinse thoroughly. We all love that tight, tight feeling of anus around our cocks, bet let's be realistic about what goes on down there when we're not prodding around. Go through the proper sanitary measures, and then relax that hole up with a few tongue strokes and she'll be ready to go. And don't be afraid to lick a little ass--we've all got to make some sacrifices in the name of anal.