Decent erotic films...

The story of O

Just the erotic movie you need. Go and purchase it.
 
Breaking the Waves is the first one that came to mind - the wife's experimentation is not necessarily with her husband, but yet it still is.

The two are not married in Secretary, but it's definitely about experimenting, and it's a funny and poignant film besides.

Bob & Carol & Ted & Alice is a comedy that's also about married couples and experimentation. If memory serves, it's not very explicit, but it might still qualify.

IMDB's keyword searches might help you if you're looking for something more particular.
 
I have some great vids (ok, a little grainy) of my neighbors "getting it on" in their outdoor jacuzzi. They probably wouldn't be upset if I shared it. Let me know.
 
When I made my previous post, I hesitated to suggest this, but Henry and June is entirely about experimentation, although Anais Nin is the viewpoint character (and her husband Hugo is kind of a chump).
 
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