A divorced guy goes to the laundry room to wash his clothes, but ends up having an entirely different kind of tumble with his young, attractive new neighbor.
A just for fun stroker.
A young man stands up for his little sister when a guy at school starts spreading rumors about her. Little sister thanks her brother in the sweetest way.
Most stories start off with two people meeting cute, dancing around each other for a little while before falling in love and eventually, finally sharing that love in a physical sense. This is not that kind of story. One dude... LOTS of different women...