TCH,
I think that the whole, "lonely Time Lord" concept is why the Doctor never "gets the girl." even though he had strong feelings for Rose he never actually acted on them and remained somewhat aloof and distant. That is just the Doctor. I recall one episode where the Doctor had to become human to hide from some intergalactic "bounty hunter types." while human with no memories he fell in like with a school teacher. I don't recall any snogging going on though. And when he turned back into a Time Lord and she found out what he was she spurned him and broke his hearts. Again, the lonely Doctor theme.
Could you refresh my memory and tell me where Tennant's Doctor actually initiated a kiss? I can't recall an instance were he did.
Amy Ponds character is very forceful yet fun. I don't like how she refers to and treats, " her boys." especially when she belittles Rory. But I think that she and rory have made good and fun companions for the Doctor. And Rory is starting to gain confidence and hold his own now. She certainly keeps the Doctor on his toes. However the Doctor still has "it" and one ups her.
River Song is still as enigmatic as ever. At first we were lead to believe that she was the Doctors wife in the future. But then we find out the she met him when she was young. And their time lines are going in reverse. Now, there is a hint that she wasn't actually married to him. It's a convoluted tail. Oh yes, there is the thing about her being in prison for killing a very important person. Was it the Doctor? We don't know. She does seem to be a strong enough person to do it if he asks her to. If that is what might happen. Ah conjecture. I like River but I hope she doesn't make it a habit to shoot off every hat the Doctor puts on, lol. That would get rather "old hat." yes, I went there, lol.
MCH