Definition - What does Extender mean?
An extender or cock extension is a hollow sheath that is worn on the end of the penis to increase its size. Extenders are typically made of rubber or silicone. They can increase both the length and the girth of the penis. Because most extenders are secured around the testicles, they do not require harnesses to hold them in place.
Kinkly explains Extender
There are several reasons one might utilize an extender. For men coping with erectile dysfunction, an extender can be worn over their flacid penis to allow them to continue to participate in intercourse with their partner. In cases of premature ejaculation, the extender reduces sensation for the wearer making it easier to delay orgasm. For men who simply wish to create the experience of a larger penis for their partner, an extender can offer both extra length and girth.