Have you ever had unprotected sex?

[Ps3]

So I have this friend who met a girl 2 weeks ago and they had unprotected sex like 3 days ago. It was a very stupid move on his part, but yesterday they went to a clinic together, and today they got their results back and  both of them are clean. So have you ever had unprotected sex before? Or have you always been responsible when it comes to sex?