As I understand your words, then, the girls will be boring again, for the lack of a male inside the house ... ah!
So, we have two solutions, we celebrate the birthday of this boy, at least once a week, or then, that he does not leave B4, since according to his conclusion, the girls alone, are unable to ride a good party with happy ending. That seems quite macho to me.
But I go further. Why take the couple to B3, if what we need is an alpha male dentri of B4?