The best part of sex is that initial penetration. That moment when it's slippery and wet, but not enough to get a good hard cock in smoothly.
I like that little leap of faith that has to be made to penetrate a wet but tight pussy.
That initial tightness and then slip into bliss. That feeling of pressure, of force to make it into the depths of the moist cavern where it will slide and slip and bring the internal juices outward.
It really is taking a chance, pushing in beyond the initial sensation of tension. It's like a relationship; getting past the emotional tension, the warmth and love is to be found beyond.
That success is what makes me moan; that penetration of one body almost forced into the other while obviously accepted.