Of course, not all men or all women will reach orgasm with intercourse or any other kind of sex all the time. For me the best thing is just to see that my girl is enjoying herself as much as I am.
Our feeling of being "done" isn't always just about our own pleasure. But often enough in your sex life, you'll probably fine that reaching orgasm once, for you and your partner, doesn't automatically turn off your or their desire for more sex or other kinds of physical intimacy. Of course, not all men or all women will reach orgasm with intercourse or any other kind of sex all the time.
And at the point of climax she is squeezing uncontrollably, in waves going up my shaft. Sex isn't just about orgasm, or about getting one or both people to orgasm, and having that be the whole point. What it all boils down to is that men and women are more alike that it seems when it comes to all of this, and ejaculation isn't a good way to tell that anyone is finished with sex.