I love cucumbers (to EAT, lol) but when I buy them I'm always self-conscious that people will think I'm going to use it for a sex toy. LOL. Silly, I know. But no, I'm not into using cukes, or any non-sex toy item as a sex toy.
I know from a friend's friend that she had experiences with bananas and cucumbers. My wife and I experimented with carrots, because you can cut them into the desired shape and make a smooth surface with a peeler.