In reply to:

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I remember this date with this Welsh girl when I lived in the UK. She made me try Marmite... I guess I failed the test since it didn't go anywhere...

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...... I remember a girl in my youth who used to stick her fingers into jars of peanut paste (peanut butter for the Northern Hemisphere) and jars of vegemite, swirl them around and then slowly lick and suck off her fingers ......

I will leave to your imagination what it looked like.