A
sexual position, usually a tight squeeze (if your with a woman) but if you
manipulate the vaginal organs (usually the clitoris because it's the most sexual stimulant on a woman's body) then the anus, or asshole, will open up like an umbrella do to the
manipulation of the vagina and relaxiation of the woman. That's when you sneak one inbewteen the cheekys my fellow brothers.
With some tedious finger and licking action to my girl's pussy, her ass
opened up faster than an
umbrella on a down poor but closed like a bank's vault when I inserted my
purple helmet warrior. She no longer wanted anal after that.