I found Nyotai-ka as one of the best stories I've ever read on this particular subject. Apart from being the first manga I find, I like it because at least it saves us some of the most common topics (The protagonist seems upset by the attraction he awakens in men) and in any case the story is becoming more interesting as that advance the chapters, without being limited to "Ooooh, I was a boy before and now I am a beautiful woman, I will enjoy it as much as I can".

Personally I expected a larger portion of ecchi, but his absence does not compromise the enjoyment of the story at all, so my assessment is positive and my recommendation is that everyone reads it. The only thing I regret is not having found all the chapters to know where the story ends.