By the looks of it there is no "Likes_water-sports" stat. How you got both chars likes ws 100% I have no idea. Did you create one?
So that either means there is no changing it, even if you create a stat.
Or that another existing stat has influence.
Example: fitness = 'energy during sex'
My guess is masochist '-100 for receiver' and '100 for giver' in order to change arousal gain. 0% tested
Note: vin_Watersports has only the mod "on/off switch", so where it is in mod manager does not matter. Just that the mod is activated.
		
		
	 
I appreciate your efforts so much, thanks again. I attach a screenshot from what I am talking about. Maybe my english is just too bad to explain better what I mean... that watersport stat there should have any effects during sexual activities or am I wrong?
Edit: I didn't create that stat by myself, it showed up in game while I was testing some older mods. Your answer brought me to the idea to look in the character files of the presets in the module folder and I didn't find there any waterport stat too. 
I always had problems with the game stability so I started a new game with up-to-date mods only but used my old chars with that stat included from an earlier try. First time I find the stat in old saves it is named "rk_VB_likes_watersports...". I tried so many mods and the old launchers (LP launcher and RK launcher) before I finally found the Lfe Play Mods Flix. I tried to find the mod that created that stat originally but gave up. Too many files in my trash folder.
Anyway, I know, atm there is no other use for watersport than to look them pee on the other. I never tried to mod myself but if i ever will I have an idea what I will do 
Thanks again, now I will sleep better 
