Girls, why do girls stare so hard when I'm canoodling with my girlfriend?

Girls check us out when we go out, but when I'm engaged in any sort of PDA with my girlfriend (arm around her, sitting close, canoodling, etc.), girls will positively gawk at us. Why is this? Are these girls who are missing this kind of affection in their own lives?
Girls, why do girls stare so hard when I'm canoodling with my girlfriend?
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