Most Helpful Guy
i guess if he's your sex buddy he'd mention it if it actually was
Most Helpful Girl
I would assume everything is casual until he says otherwise. I think guys promote booty calls and friends with benefits to get out of the ties of commitment, but it doesn't mean the majority want just straight sex all the time. Many of them do want the "girlfriend experience" of spending time together and being friends. The problem is when you offer all of that under the title of friends with benefits , when you really want a real relationship.
If you're cool with a booty call, then go have fun and don't think too much about the why's.