Hot tubs

Get In is available for me on all three of the hot tubs in my game (Pringo's Heater Hot Tub, Birthday Hot Tub, and Left of Center Hot Tub). I placed the hot tubs outside, on the ground, for testing. I also have the interactions Upgrade, Magic, Set Light Color, and Skinny Dip. I play without any mods or custom content. That makes it seem likely that your problem is being caused by mods or other custom content, as suggested by puzzlezaddict .