In my early days on LPSG (2004-2005), I befriended 2 different women who were comfortable enough to chat with me via AIM (remember that!) telephone and email. With one of the 2, we actually decided to have audio chat based 'phone sex' (neither of us had webcams $$$) one evening.
She talked some dirty talk and asked me to describe what my penis looked and felt like as my erection gre. At that time I did have a few pictures in my gallery, so she knew exactly what cock looked like. We exchanged our dirty talk until I gave her a warning I was close to cumming. She wanted me to be as vocal and expressive as I could, so she could 'experience' my orgasm with me. It was a lot of fun, and the only time we did that. We lived 500 miles apart, so we never did meet up in person.