Sex?

As I was reading a rather steamy story, a weird question popped up in my twisted mind:

When people are writing a pornographic/smutty scene, does the character(s) sexual performance reflect the author's own?

For example, if the character used a specific position, does the author do that during sex in real life? Granted, a lot of authors that write risqué material are still virgins. However, the ones that have actually done the deed, do they get inspiration from their experience?

I know this sounds totally perverted, but I was just thinking about it as I read a sex scene in a story.

Anyone have an answer?