I don't think anyone is against teaching about sex . The things the Bible says about sex is that: sex is for marriage, a man and a woman; it's supposed to be an expression of love, as well as a means to have children; and sexual temptations do occur, so we need to flee from situations where we can be tempted ( and this is where we are all different, but we have biblical principles we can consider).
Teaching sex outside of biblical grounds is not something you do lightly, because basically it's just your opinion, and because the fact is that nobody needs to hear what you do with your wife( or husband) in bed. Not to mention that not being careful with what words you use might cause somebody ( or alot of people) to stumble. There are things the Bible is silent about, and those are things you don't preach behind the pulpit on a regular sunday.
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I am saying what kayM is saying, needmeJesus, and, I am not saying that sex cannot be talked about, just needs caution and by right people in right setting, like AnandaHya says too, like a Bible study, but, personally I guess, that for teens there are, should be, anyway, I think better topics to focus on, like doing helpful things for poor in your city or doing work to landscape your church or ???
Sorry, I am older, sigh, so I probably sound fuddy-duddy, LOL, but I.am waiting until marriage for sex and I think that young people under 19 do NOT need very much sex before marriage series in big group setting.
But I do have one verse, or, two, for temptation resisting , as KayM, mentioned that word: Blessed is the man or woman who endures temptation, for when he has been approved he will receive the crown of life which the Kord has promised to those who love Him. James 1:12
Now, since I'm preaching a message on temtation, I will say the verse after this one tells us God never does tempt you with evil nor can God be tempted by evil.
Then we go to 2 Cor. 7:10 -- no temptation has taken over you that is not common to man, and, in that temptation you so desire to say I DO want to do.this, God will provide you a way out.
Yes, I paraphrased it, but that's the gist, needmeJesus, God bless and keep you, young lady