Why do guys constantly do handshakes with a specific girl?

Like I’ve noticed it with a few guys but this one friend used to it do so much but we were good friends and even my cousin well my family friend does it so much that it’s something I noticed and it can be 3 handshakes within one conversation. Happens so much I’m just like how many handshakes can one do within one conversation
Why do guys constantly do handshakes with a specific girl?
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