The naked woman that walked by Wolfgang in the pool was NOT Kala! It was some woman who was actually there and walked by him. They have nude pools like that in Europe but I'm pretty sure sex is forbidden at those establishments.
They all had psychic sex with Wolfgang in the pool because thats where he was. Just like Lito kissing Will while While Will was in the Gym...that's where he was. All 4 of the sensates involved were in all 4 places at once...
At Lito's house, at Wolfgang's pool, at Will's gym, and at Amanita's Mother's house.