I don't think the thing with Rachel and Paul was supposed to be sexy. Last week she said she wanted to have a child. So now, she's merely using him as a breeding stud. A sperm donor, if you will, although why she didn't take that route, I'm not sure. I think she was examining his teeth like you would a horse. Pretty cold-blooded.
When Helena was killed, I was relieved. Then, I realized how much I missed her in subsequent episodes. Now, I'm ever so happy she's back. As long as I think of her as semi-feral, I can understand the character. Sestra, Meathead, and Brother-Sestra are a trio for the ages! Also wish she would have offed Rachel.