A breathy voice is a type of voice where normal speech is obscured by audible breathing, or air movement through the space behind the vocal cords.
Breathy voices are seen as sexy and sensual. For this reason they are commonly used by phone sex operators, pornographic actors and actresses, and other individuals attempting to convey sex appeal.
Kinkly explains Breathy Voice
Vocal coaches believe that when a voice is driven by breath from the diaphragm, and the throat is not constricted, a speaker is more connected to their feelings and emotions. Because of this, a person with a breathy voice is more likely to arouse emotion.
Women naturally have more breathy voices than men, as the gap at the back of their vocal cords is larger.
One of the most famous examples of a breathy voice was that used by Marilyn Monroe to sing "Happy Birthday" to President Kennedy in 1962.