Given and recieved. Always in the context of a scene. The attractions are the visual intimacy as well as the hot wet feel. I don't discount the naughty/ factor. It is always a nice variation in power play games.
Never tried it but if my lover asked I give it a go - either way. Urine is sterile. If it made her happy why not.
Mudslides which I presume is scat though is just OFF.