Re: "Dead Doll" Discussion **SPOILERS**
Yes, IMNSHO, they do. I've heard a lot of people talk about Sara's so-called "daddy issues," which I think mostly stems from Grissom's age and their conversation in Nesting Dolls about Sara's dad being killed. She's been confiding in Grissom since S1, before we ever knew that her father was even dead, and not just about stuff like that. In a mature relationship of any sort (friendly or romantic), both parties can tell one another their feelings, openly, without having to worry about age. I'm not saying pedophilia is okay, but Grissom is not a pedophile. Grissom and Sara are both responsible adults whose steadily closer friendship evolved over time into romance, with some bumps in the road along the way, and that will happen between any two people. What irritates me is that a lot of relationships are sadly and shallowly portrayed as "Oh, this is the second time I've seen you. I think you're cute. I love you!"
As for other possible mature relationships, don't even get me started on Hank. Grissom's many crushes over the years included that one lab tech whose name I have either forgotten or never knew ("pin you against a wall?"), the infamous Teri (who was so centered on herself that she couldn't handle it when some annoying person kept calling Grissom, even though he apologized repeatedly and was clearly irritated), and Lady Heather. IMHO, that one had the potential to be mature, yes, but the whole "Hi, we may-or-may-not-have-had-sex-and-now-I-consider-you-a-suspect-in-a-murder" thing kind of snuffed out that candle. Catherine and Gil compliment each other well, but Catherine is (again, IMHO) too nosy and gossipy and such for Grissom's private personality. In dramatic terms, she's his foil; he's pure science with only a dash of people stuff, and she's science with a lot more people stuff than he has. She's interfering, he's reserved, she's political, he's not, etcetera. They're very good friends, yes, but I can't see them working as a couple.
By no means am I saying that "SARA IS THE ONLY ONE WHO COULD EVER BE WITH GRISSOM NOOOOBODY ELSE EVER IN THE HISTRY OF TEH SHOW." I'm saying that although Grissom may have had past... erm... liasons, I guess you could say (I am in fact convinced that Griss and Catherine were dating in the fourth season), Sara is just the best one for him, they are madly in love, and the relationship has been done wonderfully. It was gradual, it had ups and downs, it has history, and there has been a basis for it since the second episode of the show. Grissom knows her voice so well that he doesn't even have to turn around. He and Catherine were friends, he flirted with Teri, and Lady Heather and he may or may not have had sex, but Sara really is (IMHO, again) the one for him.
And I have seen the "behind the scenes." It was muy interesante. Poor Jorja, having to sit under a hydraulic car all day...