My current gf, 21, is a virgin and is very sexually inexperienced, yet a very sexual woman. Before meeting me, she had never even masturbated nor had an orgasm. She let me perform oral sex on her and had a powerful orgasm that filled my mouth with her juices. The same thing happened the 2nd time. But then from the 3rd time on, she gives no physical indication that she's having an orgasm, other than the fact that she announces it.
Why would she gush like this only twice and never again? It led me to believe she was faking it, so I asked to please always be honest with me, and if she didn't think it was going to happen, to please just let me know, and I won't feel defeated or like a failure. She swore this is never the case and she would stop me if so (she has stopped me once). She insists she's truly coming each time she says she is.
Past girlfriends I've had gave some physical cues of orgasm like the aforementioned "gush" of juices, or swelling and blushing of the lips. But I don't feel, see, or taste any indication that she's really getting off, aside from those first 2 times. How do I know if she really is? Is it possible she thinks she's coming but may not really be? I know many young girls somehow don't know if they are cumming or not. If she had an orgasm the first two times, I would think she would know what it feels lik, though.
And if she is getting off and being honest with me, why doesn't she ever gush again, or is there something that would help make this possible again?
Thanks for any advice.