Most men's ego's can't handle hearing about the details of what their mate has gone through. Just the fact that you share, may make him even that more uncomfortable if your experience is greater than his. I think you are making a mistake.
You should handle this in a different way, and get the same results. First of all, when you bring this up, you should do this when you are in a non-threatening place. In other words, not in the bedroom, and not when you are about to have sex. Discuss this over dinner, or on a drive or someplace where he doesn't feel you are going to be making demands.
Next maybe you should be approaching this in a different manner. Instead of telling him all the details of what you have done with other men, try to talk about what turns you on, and things you would like to try. He may be more receptive to something like this, instead of trying something and in the middle of it, thinking you have done this with other men, and it isn't something special between the two of you.
The way men's egos are just the fact that you may be more experienced than he, might make him worry that if he tries something "new" for him, but not you, he may not perform as well as the "other" men you have slept with. Again, try talking about this with no pressure on him. If he slowly begins to open up, don't say something like okay let's hop to it now! Give him a chance to introduce the things you are looking for on his own, once you have talked about them, and he has had time to digest them. If he doesn't come around, then "gently" at some point in time, during your love making, without pressure, ask if he is wanting to try the new things you have talked about.
Again, men's egos are fragile, and I think your boldness would scare off most men, as most aren't that secure with their abilities to begin with. I totally agree that it would be nice to be so open, most women are way too afraid of what their man may think of them to be so open, so it is a plus you are so secure with your sexuality, but you have to move slow, as his feelings are involved as well. I would much rather a woman tell me she has fantasies of doing things than describe the things she had done with other partners.
I hope this helps. Good luck, and great sex!