"This is their entertainment," Urd comments to Lind, as Bell and Keiichi engage in activity that with any other couple would be serious heavy petting/foreplay. With them, it's something out of Fawlty Towers.
The first time (in the last TV episode, no less!) we learn that Keiichi admits he loves Belldandy, she's knocked out cold by the revelation (Also a Parental Bonus). It becomes even more painful when you realize Keiichi was under an Urd spell that augmented the power of the words "I Love You", and the reason he was able to confess his feelings in the first place was because Peorth gave him a serious pep talk.
Sayoko revealing she's a member of the Nekomi Tech BDSM club "yes Keichi I'm EXACTLY the kind of girl you thought I was" (and later in the same issue where Urd has the entire BDSM club scraping at her feet begging for more)
"Ah?! Sacre bleu! Don't tell me... is the poor boy monogamous?!" -Peorth from chapter 68