Yes, these should be obvious, but they aren't. And sadly, they aren't obvious even to other trans persons. Having recently undergone BAS and GRS, and being a very attractive and successful transwoman, I am constantly sexually harassed by the other persons in the community.
Just last weekend, a CD friend of mine (and one with whom I am reevaluating our friendship) spent our car trip to SF Pride continually asking if he could touch my breasts, put his head on my breast, see my panties, etc. It was vulgar and unwanted, for sure!! Then, at lunch after the parade, he turned to me and said (quite innocently and thinking he was being funny), "I work with a lesbian, and I was telling her about you and your surgery [GRS]. She asked me to get a picture of your pu$$y, so that she would know what 'one' looks like, so that she can tell the difference and not get tricked by us in the future."
And this, from someone who should know better!! I won't repeat what my response to this was, but let's just say he is very aware not of how rude this comment was, and how hurtful it actually was to me.