Even within the (supposedly) narrow kink of watersports, I see so many variations and preferences. Desperation, merely watching, diapers/bedwetting, golden showers, etc. etc. I'd guess that the experiences, influences and encounters that shaped one's interest in watersports are even more varied. What is yours? Do you remember key events that got you into this kink? For instance,
Childhood experiences that shaped it and morphed into a sexual preference later in life
How did you learn about it? Books? Partners who led you there?
Specific people or practices that firmed into a habit?
etc.
I'll go first in my response next...