Go buy a box of Magnums for like 12 bucks. Astroglide helps too. Take a few socks and wrap/bunch them around the top of something long and cylindrical. Roll the magnum down over the socks. Make sure to leave a good buffer layer of socks on the top of the object you chose. I use a hand weight set to make mine. I attach 30 pounds to one side of the weight and put it in the floor, then on the other side I wrap the socks and roll the condom down. Take some astroglide and rub it all over it, then spit/use a glass of water to get things slippery. Then I go to town. Best part is, you can disassemble it and get rid of the evidence fairly easily.