The students are going to lie.
This^^^^every pimple faced nerdy male will say he banged the hot 10/10 cheerleaders and every girl will say she is not like the other girls and is pure as new fallen snow.
Oh, geez. I remember filling these out when I was in high school. We all had great fun with it. The first year, we went a little overboard and said things like we had group orgies several times a week. The next year, we toned it down so it’d sound more realistic and would *really* mess with them.
We did the same thing with the drug and alcohol surveys.
16-year-old boys never, ever, LIE about sex, do they? :-)
I'd ask why tax dollars are paying for this, as the info is completely worthless.