SUBREDDIT: r/relationships
TITLE: I [25M] met someone online [25F], and when our chat started turning sexual, they informed me they were trans.
POST: Title pretty much says it all.  We had good chemistry.  But its kinda a case where my expectations suddenly did not line up with reality.  And I'm not sure how I, a straight male, feel about the situation.  We had a date lined up and everything.  But now the image I was building in my head is.....well, flipped on its head a bit.  

I'm not 100% against the idea, but it feels like I kinda got dropped into it, without being aware of what I was getting into.  And so now I guess I kinda feel this pressure of....well I dont want to be rude and just say no because she is trans.  But it also feels like it was a bit misleading.  Anyone know what I mean?

I guess its rude to ask about their...parts? but then I have no idea what like.....sex would entail.

I've been doing a lot of reading around on this and other sites about the topic, but it hasn't really been enough to clear things up for me one way or another.

so...help?
TL;DR: 
met a cute kinky [f] online.  set up date, got to sexy chat.  turns out shes a [mtf].  I am confused now. help?