When I lick my wife's pussy, I like doing it from behind, that way I have her ass on my face and the first couple of times when I tried to lick her asshole she kinda freaked a little but now she gets turned on by it because she knows I get turned on by it. She even asked me to tease her asshole with my finger and one day she was so horny that she let me fuck her ass!
Unfortunately she told me that won't be on the menu all the time, but I'll persevere and will see what happens