I think star wars should never feature sex, not even a slight inuendo. Thats one of the reasons for the failuer of AOTC, the romance thing-y going on. But now you say "oh how about Leia and Solo", well, that was different. They were always fighting and denying their love, it made it kinda interesting...

Yuk, I just thought of something, Leia kissed her brother in ESB... Now, imagine what would happen if she never had met Solo, and they never get to know they were brother and sister. Yes, redneck love comes to mind.