These folks will not only show you a good time, but also do it with a literary flare and skill often lacking in other genres. Use story-telling techniques as opposed to true confessions. For horror, it's fear. For erotica, it's sexual excitement. Remember, the fact that a horror story doesn't scare you, the writer, doesn't mean that it won't scare the pudding out of someone else.
Erotica is the same.
Some writers use vivid descriptions, others use a mean and nasty attitude, and others have titillation without the thrusting anatomy. The trick is to know your market and not show yourself for a virgin. Reading and doing a little research will tell you right off if your story is new or recycled. It is not a requirement to write beyond your own bedroom preferences but it does limit your market considerably. I consider myself a writer first and foremost.