Can females reach orgasm with a partner if they don't masterbate?

Can't hurt, achieving orgasm is mental as well as physical. Getting yourself there on your own will make it more familiar.

You don't have to masturbate to be able to achieve on orgasm during sex, no. It can be helpful only in the sense the it will allow you to become familiar with your body, where you like to be touched, how hard, etc etc. if the guy (or gal, for that matter) you are sleeping with has some basic knowledge of female anatomy (like how to locate the clitorus, for example, you should be ok. A lot of inexperienced men think that penetration=orgasm...not really the case for a lot of women.

What a dumb fucking question.

I think you should know yourself at least as much as your partner does.

Of course you can orgasm without ever masturbating! Your partner needs to learn you, that's all.

You never know, anything's possible.

I would concentrate much more on foreplay, than what happens when you are making love.
Guys take a lot less to get them physically excited than gals, so foreplay evens up the playing field.
Of course, you can help yourself along, but it's a lot more enjoyable to just let go and enjoy the moment. Concentrating too much on organisms is one sure way of making them not happen.
Get a good book on making love for couples, if you want to see how easy it is to improve your sex life.