Loads of time and energy has gone into the very question "What makes a woman orgasm?" There could be many reasons why some women are able to easily achieve orgasm and some cannot.All women are different and there is no one size fits all when it comes to orgasms. Maybe you're stressed out, or on a medication that makes orgasm more difficult. If there is not a physical barrier for you to reach orgasm, then its much more important to not focus on, "Why can't I come?" but "How can I have an orgasm?"
There are many reasons why some women may think they can't orgasm. The first thing that's important to note is that just because you aren't having regular orgasms, and even if you've never had an orgasm, that doesn't necessarily mean you cannot achieve orgasm. It's also worth pointing out that there are lots of great sexual acts that don't involve orgasms. But if your goal is to reach orgasm, read on.
The first thing to remember is that in order for orgasm challenged women to orgasm is that they need the right information. On the other hand, if you've already had orgasms and you can't seem to have them now. It's probably not something as obvious as knowing where to touch yourself and how. Not that one situation is more hopeful or hopeless than the other, they're just several paths to orgasm and may be correspondingly different.
Masturbation is important because if you aren't having orgasms, it can be much easier to learn to orgasm through masturbation than through sex with a partner. If you aren't comfortable with masturbation it can make the process a bit more difficult but not impossible. An important step is to become comfortable in ones own skin, some women may just need to start with self-reflection.
Because orgasm is an event that involves so many systems in your body (neurological, anatomical, muscular, hormonal, respiratory, the list goes on) there may be physical reasons that you aren't having orgasms. Reduced sensation as a result of paralysis, aging, or some medications, the indirect effects of chronic illness and some diseases, and physical effects of medications can all get in the way of orgasm. If you can't orgasm a good first step is to talk to your family doctor to either rule out, or discover, potential physical causes. The good news is that there are very few purely physical causes of orgasm that can't be worked around.