Tenga may well have got its reputation as the Apple of the adult industry in Japan for its stylish design, but the brand takes its role as industry leader very seriously. So seriously, in fact, that it invests in R&D on the healthcare benefits of masturbation toys. If you ejaculate prematurely and/or would like to last longer during penetrative sex (and masturbation), the Tenga Timing Trainer Keep is here to help. It's a similar toy to the bestselling Flip series but is based on more rigorous science, with an inner gel designed to provide gentler stimulation. Using this masturbator to jerk off trains your penis to hold back and go slow so you don't finish too soon. Like the Flip series, it also opens for easier lubrication beforehand and, after you're done, cleaning and drying.
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