I'm a straight married guy and I love anal sex giving and receiving. My advise to you is first try to figure out if you can get over the grossed out part. If you can't you need to talk to him and you two need to pursue other relationships, because if your relationship is not solid on all levels it will not be fair to you or him. I will tell you if he has been this forthcoming with his feeling about anal sex he truly loves you, trust you, and is very comfortable with you. One thing you could try is buying a strap on and the next time requests anal play turn him over and fuck him. More than likely this is what he really wants, and you never know the role reversal you might find exciting. I know that allot of people find oral to anal gross, it feels fantastic but gross in most minds. I lick my wife, but she will not do it to me because it grosses her out also. I assure you this, if you were to put a nanny cam in your bedroom (or his bedroom if your living separately) you would find out that he is playing with his own anus while he masturbates. Contrary to other posters, I don't think he gay or weird just sexually adventures. I believe sex is about fun and pleasure, if it feels good do it.