My Doors Lock from the Inside

I am a 28 year old woman and a mentor at a post-secondary internship program. Since I'm not a professor, having a romantic relationship with a student is a bit of a grey area. Some male colleagues of mine have already (openly) done so. While I don't see myself being so bold, when I see an especially attractive student suited up (someone who looks like Dean Van Damme, perhaps), I'm reminded that my office door locks from the inside...