Orgasm too fast?

So I've been using my womanizer really often and I feel satisfied but almost unsatisfied if that makes sense. I orgasm when using it at least 1 1/2 minutes into it and it's kinda starting to get lame :/ It used to take me so long to orgasm even a reasonable amount of time but now it just happens too fast. Any ways to slow it down or can that not be controlled? Lmao.