Cock Ring
Penis rings or Cock rings are placed at the base of the penis to preventing blood from flowing back down the penis, helping men keeping the erection longer. Ancient versions made of jade or ivory were used by the Japanese during the Jin Dynasty as a symbol of being a good lover and man. Nowadays version of cock rings have improved and they feature vibration for pleasuring women during penetrative sex. These modern versions of penis ring can be used by women over dildos to add some extra stimulation during lesbian sex. We still have classic rings, without any vibe, that are used by men to improve their erection.