Why do guys like girls on their knee?

Anonymous
I was with a group of friends the other weekend and there weren't enough seats, so my boyfriend pulled me onto his lap. Even when there were enough seats he wouldn't let me get up. Why do guys like girls on their lap? One of my friends said its because it shows that they're strong and can protect you. Is this true or is it purely sexual?
Why do guys like girls on their knee?
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