Cucumber!
I use several techniques but this one is a favorite: I don't own any sextoys but discovered a very natural one: the cucumber. You can buy them easily and it works great! I adjust the size sometimes (shape with a knife for example, like a penis) or simply use it as it is. I like it when it comes out of the refrigirator, feels great. First I fantasize or see a porn movie and then I get the cucumber and use it as a penis, put it in my vagina and move it. The orgasm is fabulous! Now that I'm writing I am going all wet and I will bring myself to orgasm ...