Some times animal instinct takes over even when it comes to human biological mating process. And before you know it, you will find yourself not only knee-deep but as far as half-way across 'the river'. After getting that far, aren't you going to make it across and seek tranquility for the gathering storm brewing inside you?? Hehehe.. Exactly as you said, when in doubt or in confusion, just do it, just like your Nike T-shirt says.