When a guy and girl are sexually intimate, the practice of the guy to alternate between bottom and top holes
(anus and vagina). No particular pattern of action
is required, and the switch-off can be completely random (ie: top, top, bottom, top, bottom, top, bottom, bottom, bottom, top, fist).
Create special patterns to signify festive or celebratory
events and occassions; re-live these occassions through fantastic, nostalgic