The Dolphin requires batteries. Relationships require a level of commitment. The Dolphin takes no offense to such issues. Relationships involve emotion. The Dolphin remains neutral.
Relationships require compatibility on a sexual level.
There are many variations of vibrators. For clarification, a dildo is a penis-shaped object that does not vibrate. The vibrator on the other hand is a dildo that is battery or electric-powered, often with a control panel for variations of speed, or just a vibrating massager for the vulva and clitoris. Without debating Freud too much, female sexuality usually requires the stimulation of the clitoris for climax. Put simply, the clitoris is the same organ as the head of the penis.