Hmm dont really have a problem with the Sauna.
I can see it going many ways a couple random.
1) Ellie / Soph goto sauna, logan and Tyler watch them make-out (logan breakup)
2) Ellie / Soph goto sauna, the separate, and Sophia gets turned on by tyler and gets caught by Ellie masturbating. (lesbian)
3) Soph uses it as a teaching moment for Ellie where she gets the big "D" from logan and Tyler
4) No lesbian path just each girl with a guy. (ellie boyfriend path)
5) LP does usual, spends 50 scenes of walking and driving, 100 scenes to convince Sophia to show her breasts to the next set of guys, 100 scenes about her being turned on showing her breasts with whatever childlike names he comes up with. Going home without targeted progression on a story path.