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The mental attraction between two people that culminates in conversation/conversations of mutual fulfilment.
When two people understand eachother on a fundamental level intellectually, which provides mental stimulation to both parties in the form of brainal sex.
I really like that girl, I think she's so intelligent and interresting, whenever we are talking I feel as though we are having brainal sex!
by Moo Lavaca October 26, 2010
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