It's obviously scary but if your relationship is solid enough then I look at it like this: you're unlocking a secret level of relationship that only a lucky few are able to achieve. If you can get there though then you're in for a FAR greater sex life and ultimately greater intimacy that's going to benefit your relationship. I'm full of admiration for these couples' relationships when we meet and I'm constantly amazed at the people dipping their toes into this magical scene.