My GF loves anal sex and isn't shy about letting me know when she wants it. But one of the most exciting times was when she DIDN'T tell me. Maybe you could try this with your man...
We were fooling around with her on top. I hadn't yet penetrated her, and she was rubbing the head of my penis all around her vulva. The feeling on me was great - lotsa lube - and when she shifted slightly and took me inside, I didn't even realize that I had entered her anus instead of her vagina. Of course it didn't take long for me to register the different feeling, but by that time I was deep inside her and the fun began!
So I guess I'm saying -- if you can't talk about it with your man, you could "sneak up" on him!
Good luck (and use a condom!)
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Chazzz
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