*Minimum of three fingers or a fist.
*Dildo, vegetable or other object (penis sized or larger)
*Three dildos vegetables or other objects (smaller than penis sized)
*Flashlight regardless of size or shape.
The penetrations may occur in separate holes or the same hole but they must occur simultaneously.
Furthermore, the mouth can only be penetrated by a penis for official DP honors to be received and no amount of fingers, fists, dildos or even flashlights in the mouth can earn the official DP honors.
The female who perform a DP can be said to be a highly-evolved slut, aware that she's a sensuous, attractive being who inspires lust and is willing to give herself over over to 2 (or more) men who can use her as a tool for their own sexual gratification, while she opens up all of her body to their desires. All in her quest for a great orgasm.
Anti-porn lobbyists maintain that the men who watch DPs in pornography know that the vast majority of women outside porn don’t want it, and this knowledge is at the center of the sexual charge. It’s a social taboo: a sexual practice considered by many to be inappropriate or immoral: hence the sexual attraction of DPs.
However, in reality, double penetrations appeal to males because it is a woman totally opening herself up to male sexual desire without even the subtlest notion that this is some kind of deeper relationship. It is sex. Nasty, intense sex. Which is what truly great pornography is all about.