I agree that you two need to talk. But, one additional idea presents itself to me - how do you feel about forced orgasms? If you are interested in the idea of being made to cum over and over without control over how/when (and really I don't see how you could not like it - but that may just be me) then why not suggest it to him as another way of dominating you. Let him know how hot you find the idea to be perhaps by finding a good story where a Dom makes his sub cum until she is can't handle anymore, and let him read it with a preface that you came across it and were really turned on by it. A little hint along the lines of "I get wet at the very idea of you drawing orgasm after screaming orgasm out of me until I can barely speak to beg you to stop" may get him excited by the idea of controlling your orgasms in a different way than just denying you them.