This phrase highlights a social viewpoint that can spark interesting discussions about etiquette and boundaries in relationships and friendships. From my experience, the idea seems to emphasize respect and trust within personal spaces, which can differ greatly among individuals and cultures. For some, bringing a guest of the same gender might feel intrusive or create discomfort, depending on the nature of the relationship and setting. On the other hand, many people today embrace open and diverse social interactions, where such boundaries are less rigid. It's important to consider context: what might be appropriate in one social circle may not be in another. Communication is key in these situations; discussing expectations and comfort zones helps maintain harmony. Additionally, this saying can reflect deeper cultural or personal preferences regarding privacy and socializing in one's home. Whether you agree or disagree, the phrase serves as a prompt to examine how we respect others' boundaries and express our own in interpersonal dynamics.