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How to kiss your girlfriend in public
Ensure your girlfriend is comfortable with kissing in public.
Just like any sexual encounter, kissing in public requires both of you to consent to the act. In particular, many people have different views on whether or not you should show affection in public.
If your girlfriend doesn't like to put that on display, you need to respect that. Have a conversation with your girlfriend about public displays of affection (pda), preferably before you are out in public.