The shower scene and the bath scene in From Fear to Eternity and Dream Sorceror were both neccessary to the storyline. Compare that to Phoebe's mummy dance in Y tu Mummy Tambien or her lapdance in Importance of Being Phoebe. And Prue, Piper and Phoebe never dressed like sluts in the early seasons, the wacky, OTT outfits only began in season five.
Firstly, I don't hate Alyssa, as I think she seems kinda intelligent and headstrong, I just don't like her career choices, her mission to shut down any non-official fansite, her over-reliance on her mother and the constant men in her life. And both Phoebe and Paige dressed like whores in the later seasons, I have never only said Phoebe does, unless I'm involved in a discussion about her character. Piper was always the less-skanky of the sisters and never dressed in the type of outfits her sisters did.
She was the oldest cast member and had already gone through all the diva s*** on the set of 90210. She has power in Hollywood and wasn't gonna let things like fights on set and as***le producers get her down. She was open with her feelings and wanted to leave the show anyway. She wasn't "disgraceful". "Disgraceful" would be a word to describe her if she stormed off the set and ran to the media, telling everybody what really happened in return for a ton of cash. She did none of that and she handled her (un-ethical) firing in a mature, sensible manor.
The lapdance however was neccessary to show to what extent cole was ready to go to feel as if he was with phoebe again.
The mummy dance was just Isis testing her new body. Feeling the vibe from the previous spirit. And feeling happy and contented with the body.
Sorry but if u call those neccessary...u gotta call mine neccasarily as well.