We have a Young Adult/College ministry at my church that I am a part of. We have conference 1 a year, w YA/C dance, mime, drama, choir, and praise teams. Also during the school year we have college bible study on campus. Suprisingly, we don't talk a lot about sex, rlps, marriage, etc a lot. Most of what we have been dealing with has been centered around evangelism, spiritual warfare, and purifying ourselves so that each and everyday we can grow more like Christ.
We also had a lot of fellowship activites like Expressions Lounge (talent showcase), bowling, movies, plays, etc. We also do joint activites with the singles ministry and sometimes with the teens. I think that you starting this up at your church will be a blessing, and it will help show the teens how to be effective in their walk with Christ