Now I realize that Data was incapable of emotions during Naked Now, but I thought I saw a "reaction" when Tasha said to him, "It never happened". Also, during Skin of Evil, after the funereral gathering on the holodeck, Data said to Picard something like, "I keep thinking how empty it will be without her presence..." suggesting that he will "miss" her. Also, during The Measure of a Man, when the judge was ruling that he was a sentient in his own right, he was asked a question about a holoportrait of Tasha, about what it meant to him, and he said they "were intimate". The fact that he had hung on to that holoportrait suggested to me that he had remembered her in a "romantic" way. she had been somehow special to him.
So, guys, what do you all think, hmmm?