If Olivia and Nick have left it will be a big loss for this appartment. They initially (at least) provided quite a refreshing attitude to sex with Olivia open to try almost anything to keep Nick happy. Rimming, anal sex, toys were common place for a time and I think caused Taya and Will to wake up their sex life a bit. I will be sorry to see them go even if the excitement had tailed off a bit lately.