I have dreams about celebs, people I know, random people on the street- although strangely sometimes I have a dream that I'm physically doing it with someone else but in "spirit" I
know it's my significant other. The scariest of my dreams are that I've dreamt about having sex with a some sort of demi-god - they can be like different colors or have wings or be unusually... large or strong. Oh goodness.
Yes, I do tell my SO in the morning when I roll over, but usually he's so sleepy he entirely forgets.
Now if I am fantasizing about someone in real life I don't mention it.