A: A hollow dildo is a sex toy with a hollow interior that is worn over the penis. It is often used by individuals with erectile dysfunction or those seeking size enhancement during intercourse. Hollow dildos are typically used for penetrative sex to provide additional length or girth, or to maintain an erection during intercourse. They are designed for both partners' pleasure and can be used in various sexual scenarios, including role-playing and strap-on play. A cock sleeve, also known as a penis sleeve or extension, is a sheath-like device that is worn over the penis to enhance stimulation for the partner during intercourse. Cock sleeves are primarily used to provide added sensation, texture, or size to the penis, enhancing the overall sexual experience for both partners. In summary, while both hollow dildos and cock sleeves are designed to enhance sexual experiences, their construction and intended purposes differ. Hollow dildos focus on providing length, girth, or support during intercourse, while cock sleeves emphasize additional stimulation and texture for the partner.