Okay, why does every time I hear about a girl or boy, mostly girl who wants to have sex at a young age, knows everything about the diseases and stuff, and her man even want to use a condom, something always comes up about diseases? Like.. If she's talking to an adult..

Her man is using a condom, she is not doing oral sex, but still she gets lectured about diseases. Why is that?

Because young people tend to forget that their can be consequences to sex. Condoms don't protect against everything and they are not 100% effective.

I wouldn't say forget.
I'd say the just turn their face away from it and don't think it'll happen to them.

And will say to each other, "The condom just doesn't feel right, doesn't feel natural. This time let's not use it. Everything will be ok. Just once."

Sex is also not a thing you want to rush into, find someone you really like get tested and then use a condom.

I agree with all the above post,sometimes I think people are not afraid enough of the diseases that you could possibly get from a sexual encounter.

And I agree with Skrypt, some just assume that they will not get the disease even if thousands of others have had it because of the same reason.
Some of us like to think we are immune or that our sexual partner will tell us if they have a disease(most may not even be aware of having a disease until the symptoms show up).

I have read of an AIDs patient (he got it from an affair and before being diagnosed) had sexual relations with his wife.Both of them went for a test and the woman is told that she has contracted AIDs because of her husbands fault/cheating.

I think it must be emphasised whether one is young or old, because these diseases makes no difference whatever age you are.

Hopingtears,
Listen to those who talk about diseases of this nature and be careful always, it might save you a lifetime of tears.

Because most don't really "know" about STD's, they know some, but seldom know how often it happens, are far too trusting, and often don't believe it will happen to them.

Just like your post, you obviously don't take it as serious, or you would know why.