Bede

He said: I heard your voice in the garden, and I was afraid because I was naked, and I hid myself. It is quite probable that God used to appear to those first humans in a human form suitable for such an action through his creation, which he never allowed them to notice their nakedness, lifting their intention to heavenly things, except after the sin when they felt the shameful movement in their members under the penal law of their limbs. …

Commentary on Genesis (Hexaemeron) ↗