Looking For A Song

I am trying to find out the name of a song I heard on the radio at work, it starts out with a phone call between a man and woman, he has a very deep barry white type of boice and the female singer sounds like diana ross but i am told it is not diana ross? I do not know any of the lyrics, sorry, it has a disco sound and am told it was popular in the 70`s or 80`s? anyone who might know what this song is please let me know.