As the dev admitted he's not into this particular fetish, watersport occurences are rare and nothing to write home about. If an NPC is angry enough at yor MC (non-con or cons encounter) they may mark their teritory at the end of sex. You'll see a stat 'number of times urinated on' and that's about it. No related feats to obtain as far as I am aware, no perversely playful or creatively cruel golden shower games.
Similarly, there is very little active and fully developed BDSM content, with dedicated impact play encounters featuring various implements, clothing, accessories, disciplinary rituals (counting strokes aloud and thanking for them, asking to be tied up or not, orgasm control/denial, taking orders, etc) or even more advanced forms of BDSM play.