sigh...
how old are half the posters here? 15?
There is no such thing as a 'standard orgasm'.
First of all you studs, different women get off on different things. Some need direct clit stimulation, some need a poke. Some need it hard & some need it soft. Some need it fast & some need it slow. My own missus needs a really hard pounding, which is great cardio. She cums through anal which is rare. She rarely cums through Oral, just occasionally.
As to how they react - all different too. The contractions vary, breast swelling varies, how vocal they are varies.
Not only that - some can carry on afterwards and some can't. I remember one chick and she came so quietly, the only way you knew it happened was that she started to get ticklish, push you off (or jump off) and start sucking you off till you blew in her mouth.
The best chicks are the ones that cum through oral. You can get them squared away right at the start and then pretty much just ride for yourself after that.
Best way to know she came is she asks you back for more. Best way to know she didn't is the way her mate start whispering and giggling when you enter the room.