Hmm... I don't know. I can see why you might feel a reference to oral sex was kind of out of place in Doctor Who, but I find it hard to imagine a line like that ruining a whole story for someone.

I'm interested that so many people have brought up Ursula's fate as the sticking point for them. Would it have been better if she was dead? If this was a straight up tragedy? I think the message of the story was supposed to be that terrible things happen around the Doctor but that he is still a good thing and there is still a lot of wonder around him. Although Ursula is not brought back in full health as she was, she is brought back, and the ending implies that she and Elton are happy.