One of the consequences is that you may wake up the next morning to regret what you did. You made have contracted an STD. That doesn't make you a "victim."
Yes it does. When anyone engages in sex it is an exchange based on good faith like any other. If one person has an STD, they have a moral obligation to disclose their condition. If the person doesn't know but passes on a STD, they are still responsible - just not intentional.