Why cant I cum and I still have orgasim?

Coming should not be a goal of achievement... but a pleasant side-effect of enjoying oneself...not a badge of accomplishment.

If you're not orgasming, perhaps you're not relaxed, or maybe you're watching yourself too closely to moditor your response.

There are some excercises or positions in which female orgasm is more likely.

You can find some of this information in "Sex for One" by Betty Dodson  or a good self-help book like 'Everything you always Wanted to Know About Sex" by Dr. David Rubin.

 

Good luck.

When you masturbate alone, you are in more control and you can spend the time to bring yourself to orgasm therefore you can cum on your own. Us males can come a lot easier and a lot faster. It takes less for us to build up to and have an orgasm than it does women. If the guys gets upset, you could fake it and if he is not mature enough to be patient with you and bring you to orgasm, then its time for you to kick him out on his butt.
 

I'm never in favor of faking an orgasm.  It always seems to me to inject doubt into a relationship.

I think I'd much rather have a partner admit to me "Not tonight, I'm too tired" or "It looks like I'm just not going to come this time, but thanks for hanging in there." or something similar.

Besides, how do you know you're not over-acting?