I had similar reactions. Or non-reactions, actually, and though I have had very nice interactions with female cousins and nieces since I moved back to the area where they all live, the reality is that for the most part they don't really care about any details at all. Once we all met up a few times reunion-stlye, that was that.
I have come to realize, that with the exception of my sisters, most of my relatives are too wrapped up in whatever it is that they are doing to care about me much at all. It's not that they have no questions about my changes, they just don't have questions for me at all, regardless.
I could live next door to most of them, and they wouldn't ever come over. Male, female, whatever...
Missy