anal sex: how to convince my girlfriend

how

I find just sticking it in there to be the best tactic. Easier to get forgiveness than it is to get permission.

You convince her in pieces.

You'll only go so far...then...again, you'll only go so far...later...you'll only be pumping her anus full of your cock...so far. Only go so far each time and you'll eventually make your way home. Back to the origin of species, the anus.