Dayton was an adorable baby. I think Scott was just going along with the no sex thing because he thought that once she moved in, she'd give in. His attitude "that(being a mom) is your JOB" was off putting for someone so young.
If Courtney doesn't want sex, that's her decision and I respect it, but there were a few times I said to myself "she's enjoying this". I can't put my finger on what bothered me about her attitude about abstinence, but she seemed smirky about the whole thing. Maybe it's just the way she came off on camera.