Tenga is a Japanese brand of male masturbation aids. The company's masturbators have been noted for their design aesthetics unexpected for a sex toy, and have received an industrial design award.
Tenga does not design their products as a replacement for the human vagina. Erotic or sexual imagery are deliberately avoided in the product design and advertising. This is to avoid embarrassment for users but the design and functionality speak for themselves and the company has won numerous design awards.