Some context: My girlfriend has less sexual experience and had not orgasmed before we started dating. It was very difficult for her to orgasm for the first time initially and she only came by oral, then slowly by now she can orgasm really easily by fingering and toy as well (on clitoris). So while we have PIV sex she squirts, sometimes even multiple times, but she has orgasmed only once during this and it was according to her a very weak orgasm. She often also says that she is really close but even if I keep going exactly the same pace and angle and everything she says it passed. I know that most women do not orgasm with PIV sex and we already do incorporate touching her during and before sex. But I just want to understand what the PIV orgasm actually feels like, is it different from clitoris orgasm? And is there any way by which I can help her reach there?
PS: I have tried doing it after giving her an orgasm already. I asked her and she said it will happen and she just needs to be in the right mindset and not thinking about work and all and also needs to be at the right time in her period cycle. Also sometimes I can feel the vagina pulsating while I am inside her, is that an orgasm?