Going fast is actually better points wise, she gets a little angry and that gives you the chance to apologize, give her a hug... and that ends up being a positive.
It's like slapping her ass, she acts angry, but in the end you get points for doing it.
That one is super complex, you get points for kissing... but later when she comes to visit there's an automatic 4 point drop if you did kiss her, despite the fact that she's the one apologizing for leading you on.
Women right...
Yes, this is what i was talking about, not kissing after Ethan is a net positive(points wise, you lose a scene).
As
Justaphase said the full shower scene requires a unreasonable amount of points(or cheating), almost perfection, always pick Erynn and follow the walkthrough.
It shouldn't interfere with the getting a bike scene, just play nice Emily and you are golden.
The shower scene has such a high entry bar that if you failed to get the bike, it might be impossible to get the full shower scene because you would be missing the points from the bike ride.