@Suzanne18 I don't have your exact problem but have a variation on your theme. My rental is a 2 bedroom with a queen bed in one and two twins in the other. Maximum number of guests is 4. Every now and then I will have all men or all women where two of them don't want to share the queen. I have an airbed for when that happens and I don't charge extra since it doesn't happen very often. Yes, it's extra washing, airbed set up etc. but for me it's no big deal. If it happens often for you, perhaps you need to amend your pricing to charge for the extra room instead of people.