No, it isn't an STD. It's a type of Milkweed flower that inhabits Mexico. I love the intricate, magenta center. Originally called Gonolobus cyclophyllus, it is now known as Matelea cyclophyllus. Like many asclepiads it is pollinated by flies and has the fragrance of carrion. I must need two of them, as this one has never developed a seed pod. Do you have one I could borrow?
For more colorful photos, visit this week's Color Carnival!