i'm a HUGE water sports fan, so a good chunk of my porn collection consists of it (i'd say around 30% to 40%. Personally, as with most of the porn i watch, i prefer it to be amatuer, as it seems, for obvious reasons, more real and true to life than the often overly scripted, cheesy studio productions. however, while there are several very good amature compilations/collections on torrent sites like this, not to mention you could always search for home made videos on streaming sites such as xtube, the big studios offer a much larger, more convenient selection, as well as (usually) higher quality videos of longer duration. many major studios (treasure island, staxus, chaosmen, lucas film, etc.) have several WS videos or scenes, but i've only found a handful of studios/websites exclusively dedicated to WS that i actually enjoy and get off to most of the time. my top two of these are:

1.) boys-pissing.com - they have an ENORMOUS collection of excellent videos with some unbelievably hot piss scenes. while only a very small percentage of them are bareback (an almost required preferrence of mine), the actors and scenes are hot enough to make up for it. some favorite regular actors are: kaleb scott, chris porter, zack randall, etc. some favorite videos are: "damn thirsty", "soaking wet" and "basement threeway"

2.) goldenboysusa.com - smaller, college-themed collection, with slightly less gorgeous models in comparison to boys-pissing, but still incredibly hot. fav videos: "piss drunk roomies", "hazing", and "frat guys fuck - parts 1 and 2"

like with any porn on the internet, it's all a matter of search trial-and-error to find the right stuff for you. those are just two of my recommendations, which are kindof on the less "hardcore" side of the spectrum since i'm not really into a lot of the other kink that often comes with WS porn (ie: leather, bondage, fisting, sounding, feet, etc.). anyway, happy-hunting  and have a great day!

-OJCR