I (19M) need advice for my gf (19F)

My girlfriend goes to a college that has a big party scene, and she loves going out to the bars and frats with her friends to get free drinks and dance with them. Even though I fully trust that she won’t do anything, I don’t trust that alcohol won’t influence her in some way to cheat. Is this a valid concern? I’m not gonna stop her from going out because we both have to live our own lives, I just don’t like it when she goes to the bars or frats every weekend.