Resonance

Many people have heard that resonance can make the difference between sounding naturally feminine and sounding like a man with a high pitch. But what IS resonance? It is the reverberation of sound in a space. For humans, that space is in our chest, neck, and head. Since males are typically bigger physically, with a larger neck and head, the voice sounds larger or fuller. An analogy is the difference in tone between a cello and a violin. To sound more feminine, then, you must utilize less of your vocal space, so that your voice sounds smaller. Try to aim your voice forward, in the mask of your face, to reduce the reverberation of the voice in the back of the head. Also try to raise your larynx higher in your neck, which essentially shortens the space vertically in the throat. Subtle movements of the base of tongue can also restrict space in the mouth and throat. Resonance exercises

Facts

The physical space inside a male throat is larger than inside a female throat, typically 300 ml vs. 100 ml.

'Frontal focus' can make you sound more feminine. It is also a healthy way of talking, since it moves the vocal energy away from the neck, where tension is more likely to build up and do damage to the vocal folds.