I got this for my boyfriend of 6 months, and I own the Iroha-Yuki, and I think it's just the best! I have been wanting to get this for someone worthy in my life, and I'm so glad I did. From his mouth, it's a clean, comfortable, and excitingly unique experience. He can slide himself in, and just play with his tip simulating an oral experience, or he can use it in the shower or on land..and he is able to go twice, keeping it clean and exciting. It's so easy to wash and dry using the already provided base as a drying rack, and a breeze for me to use on him, and to clean as well. We hope to review the cups soon too. Great product Tenga!