The term "skini32" seems to be a variation or misspelling of the word "skinny," and it is likely referring to the "Skinny Dipping" genre in porn. Here's a clear description for adult audience experienced with porn videos:
"Skinny Dipping" is a porn video tag where the scenes involve nude or semi-nude participants engaging in sexual activities while they are in water, often in outdoor locations like pools, lakes, or oceans. This genre usually focuses on the natural and intimate setting provided by these environments as well as the visual appeal of seeing naked or scantily-clad performers frolicking, kissing, or performing various sexual acts while wet and exposed.