Not yet. Spoilers for Ep12 below
Depending on who you have more RP with, you go on a solo date with one of them, if your RP is high enough and cheating points are low enough, you can tell them you love them, and they'll say it back if their points are high enough. You'll then sleep with one of them while the other is left on her own looking sad
When you're on Sage's path, you can't jump off until the choice at Episode 8, there's no choice that ruins her path.
Provide you aren't a Dik, you can date all five girls at once until Episode 8, but you'll have to deal with the fallout of it (Jill is upset initially but moves on quick, but Josy holds onto it). Based on Ep12, i wouldn't recommend a Dik run for any of the main girls, but you can condense a few of the main girl paths if you know where the jump on/jump offs are. Very spoiler heavy below
Sage:
Jump On: She makes a move on your in Episode 2 during the guitar lessons, if you reject that, she'll make another move after breaking up with Chad at the Hot Party. There's no discernable difference so far. I've found the biggest decision with Sage is when she asks if you want to experiement after the Halloween Party, saying Yes has more lewd scenes, saying No is a more intimate, romantic relationship. I'd recommend branching here.
Jump Off: The choice at Chapter 8
