Try the feeling of smoking a nice joint with your girlfriend in an outdoors hot tub mhhhmmm damn only gay part it was kinda warm outside.
getting a blowjob from your girlfriend - is quite pleasurable as well But - toss in a bowl, blunt, or bong, and it's even better.
Why use a BONG, when you could just use the water around you in the bath tub to make a small gravity bong with a cut 2 liter bottle. Didn't think of that huh? Or, if this was any way possible, use the whole bath tub as a bong, meaning to somehow put a bowl on one side of the bathtub, and the other side to suck up the smoke, that way, you'll be in water and smoke