Most young female high school teachers get hit on by the boys in the school. The strong ones nip it in the bud. The weak ones encourage it. There are a lot more weak ones these days - no moral foundation.
I remember an English teacher in my school - just out of college, cute as a button. Probably half the guys in the school hit on her at one time or another. She was one of the strong ones IIRC but it took a while to sink in.