As a mom of teens, one of whom has become sexually active in the last few months, I have some thoughts on this.
1. The problem with "Boys will be Boys" statement is Girls are just like boys now when it comes to being sexual, and being comfortable with it.
When I was a teen in the 80's, girls were still the ones to say no, and hold things back for a bit when it comes to sex, and many girls back then were still saving themselves for marriage, or at least a commited partner, and NO ONE does that anymore.
When my son was a freshman he was approached by a senior girl who was very sexually aggressive, and she encouraged him to send picks, and do things sexually that I would have not done prior to my 20's. We sat our son down then, and encouraged him to consider that he is setting his reputation for the next four years by being with this girl who was known to give blow jobs on the bus on band trips, did he want to be a man whore.
We also discussed the out there forever thing with texts, posts, and pics. Lastly we told him exactly what happened with H and me when we became sexually active, and why. That we were responsible, and we understood the desire to that, but encouraged him to wait until he was with the person he saw himself spending his future with.
Being the kid of a nurse, I of course have always been ok talking about BC, and STD's, showing some scary pics of what can happen helps too.
My son has been in this relationship for 6 months, and he is truly head over heals with this girl, is she "The One" I doubt it, but he did wait a bit, and he is being careful, and he is comfortable enough to come to mom and dad, and ask for money for condoms. Luckily this lovely young lady has a mom who had raised two other girls, and has BTDT, so good decisions, and open discussions are being had all around.
Not sure about the punishment for what he did, I can tell you that we have set up the kids phone/email accounts to blind copy us on emails, and posts to FB, and Twitter. Can't follow texts, but they know we do random phone checks, so hopefully that discourages it enough. At my house punishment would have been scrubbing toilets, showers, and windows (because that is what needs attention right now.)
Wow I rambled a bit, but that's my thoughts.