I can't think of anything that jumped out at me as particularly sexy. Maybe the Angel/Darla sex in Reprise.
Day 1 - favourite female character.
Day 2 - favourite male character.
Day 3 - least favourite character.
Day 4 - favourite episode.
Day 5 - favourite season.
Day 6 - favourite couple.
Day 7 - least favourite episode.
Day 8 - least favourite couple.
Day 9 - favourite villain.
Day 10 - something you liked that most people didn’t.
Day 11 - something you hated that most people liked.
Day 12 - least favourite season.
Day 13 - favourite character arc.
Day 14 - a scene that made you laugh.
Day 15 - a scene that made you cry.
Day 16 - something that made you think “WTF?!”.
Day 17 - saddest character death.
Day 18 - best “Team Angel” line-up.
Day 19 - favourite Cordy moment.
Day 20 - favourite Wesley moment.
Day 21 - favourite Gunn moment.
Day 22 - favourite Fred moment.
Day 23 - wackiest-looking demon.
Day 24 - a character who didn’t get enough screentime.
Day 25 - rec a fanfic or fanvid (or both).
Day 26 - something that you wish had never happened.
Day 27 - something that you wish had happened.
Day 28 - sexiest scene.
Day 29 - ickiest scene.
Day 30 - whatever tickles your fancy