Not your kind of sex, but the flowers' desire to replicate their species, year after year. Their bright colors are essential to attracting bees, butterflies, wasps and other insects whose job it is to spread sticky nectar from one gender to another, or parts of, or something like that. Bees take their share and feed their fellow bugs and eventually create the drippy honey we put on biscuits and pancakes. So, thank God or the insects or whomever for the fabulous colors of flowers. Puppies and kittens have to be housebroken, taught to fetch and not to destroy mama's new shoes.
Flowers just sit there with their feet wet looking good for days and weeks.
Most orchids will last for months and then re-bloom next year. Flowers are the number one gift in the civilized world. It's because they are not too expensive, are not fattening and will not create a liver problem. Flowers are a symbol of love or affection or thanks or whatever the card says. Fields of wild flowers are a wonder to behold.