It's a fact that a large number of women can't achieve orgasm through penetrative sex alone. This is because penetrative sex oftens fails to provide clitoral stimulation (can depend on position). So the man needs to invest in more foreplay, or penetrate in positions where he can stimulate the clitoris manually.
The penis is not particularly shaped to stimulate the g-spot so that can be difficult also.
You don't mention how much time you invest in foreplay, but perhaps you should put more emphasis on this. You have stated that you can achieve orgasm through masturbation, so that would suggest that your boyfriend should be able bring you to orgasm via oral sex or manual stimulation (fingers), perhaps with a little guidance from yourself.
Take care...

Hi, dear! Don't worry, you and your bf do everything right. My wife had this problem, sentia pills helped her. Now she can achieve it. She says she has a "bouquet" of different orgasms and feels themvery "deep".

Try This Urgent!
Posted: 03-03-07 4:58pm

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Nobody has told you the real way to get an extreme delicious orgasm to the woman,,,just try this,,,follow this instructions,,...
1)the woman have to laid on one side and lift one leg wide and high,,exposing her vaginal area and her anal area.
2)the man have to hold her lifted leg on one of his shoulder,,and...
3) with his fingertips he will caress and tickle her anal hole and vaginal center area with a lubricant.
4)do that for a while until the woman is very wet and very desperate for intercourse
5)now the man can start penetrating the woman in her vagina slowly,,
but only penetrate the penis head in the vagina several times until she get wildly desperate to be penetrated with his full lenght penis "" do it!!!."
6)this is the most important step,,,,,ok,,,,now while penetrating her vagina,,,the man will tickle and caress her anal hole,,,,also the man can penetrate only one fingertip into her anal hole and unplugin it quickly.
7)by doing this the orgasm on her will be extremely delicious and unforgotable,,,,,she will be extremely hook on this way of having sex,,,that she will be wanting it everyday more and more.

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i have the same issue i cant orgasm without a clit stimulis and most of the time that dont work... and i dont get horny anymore either and im 18... it sucks i use to get horny easy but i cant now ans i cant orgasm i could have sex 20 times and maybe ill orgasm 2 out of 20 maybe... foreplay dont work ..nothing does

I have never orgasmed! I am 18 yrs old, and have been with my boyfriend for 2.5 yrs. Im not sure why I cannot reach an orgasm!! Is this wierd??!!

i am 17, and i have only been able to orgasm once by masturbating but when my boyfriend,well,masturbates me {im not sure of how else to say it...fingering?} well, i barely even feel wet outside, but he says im wet inside.which makes the whole thing sort of unconfortable. but its not that i am not satisfied, because i am, except for that little detail. is there something wrong with me?

i'm a woman and every time i reach orgasm i can feel it but nothing comes out , y is that? i want stuff 2 come out like a normal woman

i cant get one and i feel it but nothing idk whatto do