Forgive me if i somehow come across having a dirty mind but that is the first thing that popped up when i came face to face, literally (the imposing thing twice the size of my face), with this huge blossom. I was startled, then captivated, filled with wonder at such a rarity. Stare it down and you will melt.
Here's part of wikipedia's description:
Aristolochia grandiflora produces large solitary flowers from cordiate leaf axils. Leaves can be up to 25 cm wide. Flowers are heart shaped: 10–20 cm wide and have tails that are up to 60 cm long. The flower is green/white with purple/brown veins. The center of the flower is darker colored, which attracts pollinators along with a distinctive odor to its reproductive elements. The flower has three sections, utricle, tube and limb, characteristic to all Aristolochiaceae.
Seems to be describing woman parts, don't you think?