If you are asking this in a sexual way, then I prefer you and your boyfriend explore different things more often in the bedroom if you are having this problem.
Talk to him. Sit down and have a chat about it. I was the same with my prev bf. After we had a talk he tried to do it for me, then he eventually started liking it himself. I think the best thing you can do is share your feelings about it with each other.
you will find he is really receptive to it