Know the laws and University Policy about rape and sexual assault and tell your friends. How you can ask for consent, how you can clearly say yes or no to a request for sex, how you can respond if someone tells you no, how to stop a friend you think might be in danger of going off with someone abusive, or how to say no to someone who tries to get you to help him get someone drunk so he can have sex with her.
People have many kinds of responses to being sexually assaulted.
Some people may feel very afraid, some very angry, some very calm and contained. Most have a lot of difficulty concentrating on studying. Some have difficulty sleeping or eating. Many blame themselves. Rape and other sexual assaults are very traumatic, but people can recover if they get help.