I think you are over reacting. I myself love it when my wife does this very same thing to me. It dosent happen often but when it does look out baby here it comes. I dont feel that im gay or have gay thought or whatever you want to call it, If your not comfortable doing this to him then you need to let him know this. If he dosent accept it then tough buy him some anal beads or whatever and watch him go to town, maybe you can help him out with a handjob or something like that. He then needs to understand your discomfort and not force the issue, trust me if he is male he is just as good at getting himself off as you are. No offense to you hes a GUY never forget that.