CCS is filled with peak degeneracy, but carefully hidden with excess cuteness.

The only "normal" couples in CCS were:
Li + Sakura, and Chiharu + Yamazaki

the other relationships were
Miduki Sensei and Eriol (Female Teacher + 10y Boy)
Terada Sensei and Rika (Male Teacher + 10y Girl)
Sakura and Yukito (10y Girl+ 17y Guy)
Li and Yukito (10y Boy + 17y Guy)
Yukito and Touya (17y Guy + 17y Guy)
Akiduki and Touya (17y Transvestite + 17y Guy)
Fujitaka and Nadesico (Husband + Ghost Wife)
Sonomi and Nadesico (16y Girl + 16y Girl)
Sakura and Tomoyo (10y Girl 10y Girl)

Sakura, Kero and Yue - Master, servant, and pet. Threesome.

A magical girl and a stick - Why can a stick change its size?
Tomoyo and Costumes - You never know what she does with Sakura's battle costumes after battles.
Tomoyo and Video - I bet there are hidden cameras in Sakura's room.
Naoko and books - Do you know Yomiko Readman from "R.O.D"?
Clow Reed and Yue - Why was Yue sooooo attatched to him?