I agree that people when young usually don't care who they are doing sexual stuff with because of all the new hormones and such as long as they don't think it is wrong.

From what I have seen doing this will not change ultimately who you are primarily attracted to but it might make you more open minded or even able to have sex with someone you are not attracted to very much, like if I were to have sex with a grown-up. It's possible but not really my primary attraction.