Earphone positioning and retention

A method for placing an earphone into a wearing position on a user, the method comprising:

• inserting an earphone into the outer cavity portion of a user's ear, where the earphone comprises an eartip, a body portion, and a retaining member;
• where the eartip comprises an oval-shaped first contact surface at an opening forming a hole through the eartip;
• where the body portion comprises a second contact surface formed to conform to an anti-tragus portion of a user's ear;
• where the retaining member comprises a third contact surface formed to conform to a cymba conch portion of a user's ear;
• where the retaining member is removeable from the earphone;
• and
• where the retaining member comprises a loop configured to fit entirely over the body portion;
• pressing the earphone inward toward the user's ear canal until the oval-shaped first contact surface of the eartip contacts the ear canal;
• turning the earphone a partial rotation about an axis that is aligned in the direction of the ear canal until the second contact surface of the body portion contacts the anti-tragus portion of the user's ear and the third contact surface of the retaining member contacts the cymba conch portion of the user's ear;
• and
• removing the retaining member and fitting a replacement retaining member over the body portion.