Definitions for "Double Penetration"
Could mean: Two penises in the vagina, two penises in the rectum, anal and vaginal sex at the same time or any of the above combination. Follow the above link for more.
simultaneous penetration of the vagina and anus by penises. (Note: sex toys do not count).
A sex act in which one partner, the woman, takes two erections, one in her vagina and the other in her behind, at the same time. Usually only takes place in pornographic films. PBR