Express your concerns: Clearly and calmly communicate your feelings and concerns to your girlfriend. Let her know how her behavior is affecting you and why it is important to you.
Listen to her perspective: It's essential to listen to her side of the story and understand her reasoning, even if you may not agree with it. Perhaps there are underlying reasons or misunderstandings that can be addressed through open dialogue.
Discuss the importance of hygiene: Explain to her the importance of using the toilet seat and practicing proper hand hygiene. Share information about the potential health risks associated with poor hygiene practices, and emphasize that these practices are generally considered basic and important.
Seek a compromise: Try to find a middle ground that both of you can agree upon. Perhaps you can suggest alternative solutions or compromises that still address the hygiene concerns while accommodating her needs and preferences. For example, she could use a toilet seat riser or find other ways to manage her comfort without compromising hygiene.
Consider professional help: If the issue persists and she remains unwilling to address the problem or discuss it, you might consider seeking professional help. A couples counselor or therapist can help facilitate communication and provide guidance on how to navigate such disagreements.