Olivia doesn't frequently offer her belly up for rubbing, but, on the rare occasions when she does, it isn't a cat-trap: She will lie beside me purring away for as long as I am willing to rub her belly and her armpits.
If, however, I just reached for her belly without her specifically lying beside me and rolling onto her back with a plaintive look, she would greet me with undiluted contempt. "What are you even doing? You know the belly is invite only!"
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As always, please feel welcome and encouraged to share pix of the fuzzy, feathered, or scaled members of your family in comments.