Why do we lift our leg up when our guy kisses us?

I know that we sometimes do some things that are reflexive or learned. I know that when my man kisses me, I lift one leg. I read somewhere that this was learned from Hollywood. I am not sure. I seem to do this instinctively. Do any other women do this? Guys, does your woman do this?

Why do we lift our leg up when our guy kisses us?
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