“I do not believe the request is unreasonable. Had it been me (I do have secular magazines around the house) and I had guests over, I would have understood the request to put such magazines out of sight*, even if I don’t mind having them around the house.”
So its okay if the gests keep halachah in yur house. Very nice of you.
“because you think pictures of women are untznius”
Pictures of women ARE untznius.