You can look at pictures of my bum, or you could be licking it.

 Why not?  Who would know? I won't tell.  Only we will know.  I could be sitting on your face, my nylon bum rubbing all over your nose and mouth.  I could lie down on my stomach with my legs spread; you could lie between my legs, kissing and tasting my bum  for an hour.  I could be on all fours, surrendering my tight asshole to your cock as we spend a whole night fucking.  

 If you are a married man or have a girlfriend, imagine doing one or more of the following.  Imagine the heady mixture of guilt and pleasure...

Talking to your wife on the phone as you are using your free hand to apply lubricant to my hole.

Taking photos of me clenching your wedding ring between my bum cheeks.

Writing your wife's first name across my bum with a marker pen.

Cumming over my hole and then wiping me dry with a printed out photo of your wife.

Scattering photos of her over the bed before we have anal sex.

Gasping her name as you cum in my bum.

Letting me have a worn pair of her tights and panties as a thank you for sex.

Having me round for an hour when she is at work, and fucking me in your bed.

Allowing her to think you are spending a quiet night in a hotel room after a work trip whilst you are actually spending an entire night having sex with me.

Does your wife let you lick her anus?  Will she lick yours?  I bet the answer to both is "no".  Behind a closed door, we are safe from anyone knowing that we spent time licking each other's shit-holes. 

No need to feel guilty about burying your cock in my bum; you're probably just giving me what she does not want.