Not at the party and behind the shelter only in another run with raised stats.
That is one thing, the game instructions are, let´s say, incomplete. Current arousal can play a big role on what is happening and raising the stats without forethought leads just one way. At gamestart you have to raise stats to a certain level, but then you have to be careful! Current arousal is the kicker, since it resets every day, but only as low as your openness/slut level is. Raising the stats too far or too fast has repercutions, since arousal drops not deep enough some day.
So sometimes taking a choice which does not gain any stat or even taking a "tactical hit" with the stats dropping a bit can be important. For instance, you can touch Clara´s breast with as low openness stat as 3, if current arousal is 7,8 or more and you were a decent boyfriend. But even a openness of 5 can shut you down, if current arousal is low. So balancing is a key point!
And I am quite sure that there are some flag events, like with Amy and the biker, where you get just one chance to stop this. Or it seems to have quite an impact if you "whistle on" your promised blowjob at the frat party and get Clara out of Gordon´s hands on the dancefloor. While that torpedoes Clara´s revenge and she can be a bit miffed, later on she likes that you did it. And more important, if you do this, Clara is more resistant and Gordon has to force her even at rather high current arousal behind the shelter.
It has impact, not necessarily on stats, but hidden flags, how you treat Clara and several situations. If you are there for her, tell some guys choice words that Clara is your girlfriend and they should find someone different, no "sharing" with Betsy outside the first "proxy kiss" (which was talked about by Betsy and Clara beforehand), etc. makes Clara quite resistant even at rather high arousal.
Likewise has the sexy clothes path impact. If you encourage her and find it good, Clara will tease you about it, that you like her showing off and will be more willing to wear sexy clothes or even do some stuff in public, as long as it keeps to that only.
Which can be part of a loyal playthrough or a slutty one.