I bought this as an entry level strap on to use with my husband. We were looking for something on the smaller side, and this fit the bill. This has a harness and a dildo that inserts into the harness. You could use other dildos with this same harness if you wanted to try other sizes. The harness is adjustable and with straps that you loosen and tighten as needed. I'm a plus size gal and was worried this wouldn't fit, but I was pleasantly surprised that it did fit! My only complaint with the fit of the harness comes with my body shape. I have a B shaped belly, and that seems to keep the harness from going to the exact right position it needs to be in for the perfect angle. I am still able to wear it and use it, but with positioning the dildo for insertion and thrusting it can get a bit tricky. I'm confident though that if I spent some time outside of the moment I could perfect the fit and it would be perfect. I will say that the fit and positioning of the harness and dildo does not take away from my husband's enjoyment of this! This is one of his favorite toys to use, and he wants to use it often. We still have lots of fun with this! The size is just right for beginners which was important to him. The dildo comes out of the harness for ease of cleaning which is a plus!