Very carefully.
https://www.amazon.com/Morning-Wood-Inch-Dildo-Suction/product-reviews/B004VB82KY
Morning Wood, 6.5 Inch Dildo With Suction Cup
Looks: The pictures decided to choose interesting angles. The thing is at about the top 1/3 there is a decent incline, and another incline at the back 1/3. This is not as "straight" as the pictures would show. Which makes insertion somewhat difficult but manageable, but if you are a man using this on your woman go slow because the curvature can easily turn things sour. If you are a man using this on your man be prepared for sewage spill. Also a very important thing is the head is not pink there is no shading or color change, this is a very bland, neutral, brownish. I would say the color is comparable to an UN-tanned person at the beach. If you are a man using this on your man be prepared for the color to darken quickly over time.