[JamesCasanova]

Actually I was hoping to create something more interactive, like two people who have sex (or want to) in the real life and are too shy to share their fantasies. So with this you could vote them and, apart from getting new ideas, you would be notified just of the tips your partner DOES like and he/she of the ones you DO like.

[mynameisme]

http://mojoupgrade.com/ does what you describe. They don't allow users to enter their own, but they have a pretty comprehensive list.

[JamesCasanova]

I did not know this service, great you told me