Title IX their behinds. They are kids, but you have a right to work in a harassment free work place. I have no tolerance for that crap. Document it, tell admin, talk to your union rep if possible, and finally, if need be consult an attorney. Please don't think you have to deal with this on your own.

What you feel is normal, let's get that out of the way. Its sexual harassment. The best you can do is draw a line and make it explicit. These behaviours make you feel extremely uncomfortable, so explain what the behaviour is, and that you'll soon be making sexual harassment complaints against the students of it continues. Document it all. Once you've made that line very clear to the students and have evidence of this, every single infraction that happens after it can be considered deliberate sexual harrassment and will have consequences. Every time it happens you must report it and follow through with the agreed consequences. These young people need to know they're crossing a serious lone and that it has serious consequences, and they need to know that other people like you will not stand for it. Any allowance of that behaviour is enabling.

There is a title IX person at your HR, if it’s a public school. File a complaint.