It's important to note that this isn't about giving in to your partner's every whim and completely abandoning your identity (or putting yourself in harm's way). It is about practicing selflessness.
Continue to express your needs and desires, but then really tune in to what your partner desires. And then, do what will make your partner happy. It may sound like a radical idea, but if you both commit to trying it, you both will invariably manage to get your way more often than not.
See all of Dr. Berman's sex homework assignments