how do i know if my gf has reach orgasm?? many “water” come out ??

This is a rather good reference:

so girl will hv orgasm everytime during sex?

Not every girl could experience orgasm for every intercourse.

how i can make my gf nore “excited” and reach orgasm?

It’s unique for everyone, you need to communicate and try more with your girlfriend so that you know how she feels during a sexual intercourse

However, usually the clitoris is the most sensitive part of female in achieving orgasm so you can give a try :slight_smile: