How do you know if she has an orgasim?

How do you know if a girl has an orgasim? Because if she lies, I won't want to say: "Did you have an orgasim?" and she says "Yeah." and in her head she says "No..." so is there a way to tell if a girl has had an orgasim?

usually they will be wet in the vagina, and they will get goosebumps, they will get tense, probably arch their back, and be exhausted afterwards. you'll know for sure, usually.

Well some signs that you could actually see, is like for instance if her breasts for some reason appear a little bit larger than usual. And sometimes the clit becomes more noticable, and the labia majora (I think that's what its called, those little lips,) looks bigger as well. But I mean of course you're not going to check down there, but the easiest sign is like when her cheeks get a light pink glow. They usually start to sweat. But is you think that she's never had one, well you guys need to talk it over because a lot of times girls just tell their partner oh yeah, it feels real good and thusly making you think that you did a good job and you keep on doing it because that what you think she likes. And if this is so, tell her to try to not have an org**m. Because if you focus too much on trying to get one everytime, it keeps your mind destracted off of listening to those senses. Well good luck! Hope I helped : )