I have been on hrt for three years. I have sex twice a week usually, with one to two orgasms in a two week period. It's much more difficult now but it doesn't bother me much if I don't. I do not top, not ever and no one but me and the girl who does my electrolysis touches it, not even my boyfriend. I don't mind contact with him but handling is definitely out. It's at least an inch, probably closer to two inches shorter than before hrt, it mostly gets as hard as ever but nothing comes out.
I don't know how much it has effected my estrogen. It doesn't seem to be a problem, I am happy with my transition.
Hope that helps.