The toy is made in the shape of a rigid penis and is hollow on the inside. The idea is to allow a penis to be inside. Becoming hard while wearing this toy is very painful, especially the chafing that occurs at the penis end. The inside is too small for an erect penis to be comfortable (even a small penis), and the material is so hard that an erect penis gets bruised from smashing around inside the toy. Speaking of bruising, the flare at the base of the toy is perfectly shaped to pinch the wearer's scrotum and smash into the wearer's testicles. In my case, this became so painful that I didn't have to worry about the bruising and chafing caused by having an erect penis inside of the toy because I quickly became less aroused. This was not the type of good pain that makes sex better. As for fitting inside of my partner, she was very happy at first, until her insides became quite bruised from the inflexible material. Using a rear-entry position made this better because the toy was able to have a straight shot into her, but any other position was plain miserable for her. Adjusting the elastic strap was an exercise in futility, especially since it quickly lost its elastic qualities.