From Indopedia:

“Macrophilia is the sexual attraction to a larger person. It is the opposite of microphilia. These phenomena are two sides of the same paraphiliac coin, with most fantasizing about both being a giant and being in the presence of one. Macrophiliac fantasies seem to take several forms: with focus on hands, feet, breasts, genitals, or mouth of the object of desire, involving either sexual or asexual encounters, with or without consent of either party. Since the existence of giants or giantesses is strictly fantastic, macrophiles must depend on their own imaginations or pornography to fulfill such desires. Consequently, the latter has become a growing enterprise in the first decade of the 21st century.”

Now, here‘s a very interesting article from i09.com by Charlie Jane Anders about “The Larger-Than-Life Sex Lives of Giant Women”. As a bonus, the piece comes with lots and lots of free NSFW giantess images for you to peruse at your leisure, along with links to sites and communities dedicated to macrophilia.