Oh come on, don't tell me a naked woman screaming YES! YES! YES! isn't using sex to sell... When was the last time you heard a real woman scream YES! YES! YES! when she is just washing her hair... Gimmie a break.
Maybe she is glad to be getting rid of hair lice?
Its like Britney's nipple. People believe they see it, others don't. Its a bit of perspective.
The Commercial people were smart and realized some people would associate the sound with "orgasms".
Now if they were a real orgasm. I would have my tape player ready.