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Most researchers in this area just put out written questionnaires about women's orgasms so these studies are not very accurate. Kline-Graber actually measured and observed naked women having orgasms using various contraptions and equipment. So Kline-Graber's indicators of women's orgasms are very accurate.
I've field tested fuck routines that I've derived from Kline-Graber's on many women working in sauna parlors (I can't remember how many but too many to count) and 100% of these women who get laid 12 to 16 times a day are very surprised of having vaginal orgasms for the first time. Some have had clitoral orgasms from oral sex but they're in the minority.
These are the field tested indicators with scientific backing:
- 1. Involuntary abdominal spasms. The girl's abdomen hardens for a few seconds and you'll see the spasms.
2. Involuntary shuddering of the whole body. This occurs when the girl raises both of her tense legs to meet your penis; partially raising her body and her entire body shudders, most especially her legs. This is not like an epileptic seizure. The shuddering is more subtle but clearly distinguishable.
3. Involuntary vaginal contractions which makes the labia minora and the vaginal opening twitch. Mild orgasms have 2 to 4 involuntary contractions while intense orgasms have 6 to 8 involuntary contractions.
4. Reddening of the chest. This does not happen often.
5. Others. These happen only to certain women.
The best way to illustrate this is through Japanese porn actress Ai Himeno who is very orgasmic. At any rate, 35 minutes of fishing for clitoral orgasms is too long. You should aim for the different vaginal orgasms which will make the woman better fulfilled and satisfied.

Thanks a lot for the response !
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1. Involuntary abdominal spasms. The girl's abdomen hardens for a few seconds and you'll see the spasms.
This thing i recognize what happened yesterday, vaginal contractions as well, the others i didn't really notice/look out for.