There are various types of duo toys, such as remote controlled, app controlled, prostate massagers, masturbators, unisex vibrators and wearable vibrators. Also consider is it water proof? USB rechargeable? Made from Body Safe Silicone? Vaginal or anal use or both? Dame has some best selling couples toys to be used together for added clitoral stimulation, check the Eva and FinMagic Motion has app controlled wearable vibrators, such as Magic FlamingoMagic NyxMagic Fugu and Magic Vini. Tenga also has masturbators which are fun to use with a partner, such as the Geo Aqua and FlexLora DiCarlo has vibrators that are for unisex use and have a warming feature, check Tilt and Sway.