[Chemist_Geek]

This PROMOTES the behavior as acceptable!

Err, no, it doesn't necessarily. Would you say the same thing about a smoking survey? A drinking survey? A drug use survey?

[Shethink13]

More seriously, I don't understand the reaction of some posters here. It seems to me that in order to fix a problem, to wit, sexual activity amongst the "yutes", one does have to know something about the extent of said problem.

The only problem I am interested in fixing is one that involves MY OWN CHILDREN, and I will solve said problem, if one ever exists, in the way I see fit, without the intrusion of some namby-pamby liberal educator who will only gum up the works.

If they are going to proceed in a fashion that is contrary to MY brand of upbringing, I will most definitely protest and insist they stick to the three R's.

[G Larry]

Yes, "necessarily"!
Especially on this subject.

Think back to when you were 15.
Imagine the implication if the faculty presented a survey, such as this.

"They wouldn't ask these multiple, detailed questions if they didn't think 'most' kids were active."
...would be the most natural reaction of a 15 year old.

[Adder]

Why are they being subjected to this survey at all? They are in school to get an education, not to enable some researcher to spend grant money. They are captive guinea pigs, under pressure to participate irregardless of the opt-out proviso. Re your smoking and drinking surveys, yes those would be objectionable for the same reason. Schools are not little social labs for the jollies of researchers.
Besides, behavior can be influenced by these surveys: its pretty easy to construct questions that reflect negatively on behavior... some about racial attitudes or drinking or smoking.