Yes they could. Playboy is considered a strong mark in the trademark sense, doubly so in its own industry. Would definitely advise against that.
If you are interested in trademark law you might google about the differences between a strong mark and a weak mark. Ideally you would ask your lawyer though. If you don't have one it is something worth sorting out before you need it. Having a good business lawyer is invaluable, I would recommend asking friends who run their own businesses who they use if you need to find one.