There was also the Cersei and Jaime "rape" scene in the mausoleum or whatever you want to call it while Joffrey was lying dead right next to them. Again, nowhere near what happened in the books where instead Cersei was overcome with grief at the death of one of her children and so wanted to fuck the father of said child. Sure it was her brother so there's the incest angle going on but both in general and specific to parents who lose a child the drive to have sex while mourning is extremely high. In general because being close to death can jumpstart the need to reproduce, and specifically in the case of a mother who just lost a child having the biological compulsion to "replace" the loss.