No u shouldn't leave it open.
It can be really dangerous.
For example: It might sound crazy but imagine a rodent eating the hose that the gas passes through,the gas leaks and dangerous things can happen cuz propane is flammable especially when mixed with air(oxygen).
(Tbh it's all of these I would think) But mainly Heart Issues.
1. Sex education
2. Chaperones.
3. Parents actually taking care of kids.
4. Having a 1v1 conversation.
I would assume your teacher would want you to put something like "refrain from sexual activity" but if not, the answer would be to get tested frequently and have safe sex (condoms, dental dams, etc).
