Poor guy. It's not like he just woke up and said I want to make an Harem, is it? He just can't say No to any of the girls around him, and since they don't mind to share him, as long as they get a piece... How is any of this HIS fault?
Now, for an even more radical thought... Have you Christine, considered that they are the ones interested in being in an Harem? I am always upfront, I let them choose, only those that want it too are IN. So how is this sexist when they are the ones with the power of choice? I merely show an interest and am upfront about the others, no deception, no tricks, no abuse of trust. I give them time to think, to consider everything, and then they choose. By the way, we should go on a date one of this days, I really want to discuss this further with you, while getting to know you better. Oh, I will tell them, no worries.
Peace