<human>: Can you succinctly summarize the text in 1-3 sentences?

First time post, throwaway for obvious reasons.

The other day I was using my boyfriend's computer, and while attempting to access my own Facebook, his Facebook-related internet history popped up in the internet search bar. There were some unfamiliar profile names that appeared.

Curiosity killed the cat, and I clicked on them. I've only found two, and they are from former college students of his from last semester, both 18 years or older. He's spoken of these students before, and I've even helped to grade some of their assignments. From what I've heard from him, they are both trashy looking girls, and one has a Playboy Bunny tattooed on her breast. Wonderful. 

I looked through his Facebook activity log search tab, and apparently he checks their profiles a few times a week? He isn't friends with them, but he searches their names on Facebook...he searches their names more than mine...

I don't think that he is cheating. He has never hidden anything from me, and we have a wonderful relationship. We treat each other with love and respect. However, the fact that he's checking out his student's Facebook profiles skeeves me out. I think that it may be in a sexual context, because in bed, he sometimes likes to pretend that I'm a student/bad girl and he is the professor...which is hot, but now I feel weird about doing that knowing this new information. 

I'm pretty sure that the professor/student dynamic is just something that gets him hot, and I have no reason to believe that he has/will act on it...but I'm not sure what to make of this. Is it a red flag? Are there any instructors on Reddit that do similar things? What should I do? Please help...
<bot>: Graduate TA boyfriend Facebook searches two of his former students on the reg. Is this innocent, or a red flag? What do I do?