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If you know how women pee, then I don't get why you posted this as a question, since it is really more a discussion about a particular thing you are interested in or have a fetish about. . .
There are over 40,000+ pics that have been uploaded to this site in appreciation of the female body, and the female labia.
I suggest you start looking through them as there are plenty that have been already posted in High Definition with enough emphasis on the vulva that you can see the woman's urethra quite obviously.
That said, I'm going to close this discussion, and invite you to take a look at the many threads in the following categories: