I don't think my voice is that high generally, but sometimes I do try and put my sexy voice on to sound older. I did answer the phone to a friend that way once and he definitely enjoyed it, maybe a little to much... So I wasn't as keen to start talking like that at work.
That reminds me of when I was in school actually, I went through this phase where I would talk with this ridiculous baby voice, I don't even remember why I did it, I guess I was trying to sound cute. I did it for weeks. Bare in mind this was about 14 years ago. I was a little special growing up....