The tongue moves in a somewhat circular, flapping motion that really does simulate the feelings of oral sex. In addition, it can also be used for very effective nipple stimulation. The tongue is insertable, though I found it most effective when used for external stimulation.
The most helpful critical review
Not Exactly the Tongue I was Expecting.
Unfortunately, I was very disappointed by this artificial tongue. When I was younger, I always saw advertisements in my parents dirty magazines portraying these as the be all, do all to oral stimulation. For me, the mark was missed. I may eventually continue my quest to find a realistic pussy licking device, but this was definitely not it.
This is the travel size version of the Tongue vibe so you never miss an orgasm again. Made from ultra realistic flesh-like material, the soft tip provides constant and tireless licking upon demand with a three speed controller. Total length is about 6 inches with 3 inches insertable tongue. Toy is equipped with a discreet silver bullet that plugs directly into the battery pack for extra vibrations. Uses 3 "AAA" batteries (not included). To save on batteries use the special AC adapter made exclusively for the Tongue vibes.