From Dictionary.com : mediocre means "moderate to inferior in quality", "poor". Granted, it also means average in a few contexts, which is obviously not the case here. And "mediocre time for you" was sounding funny to my ears :) Not entertaining nor erotic. Well, maybe. I found it funny and it looks...

I'd like to receive feedback about this idea I had. Basically, once triggered, you'll be a very bad lover. You'll orgasm just fine, but your partner will be highly disappointed by the quality of the intercourse. It can be funny as a simple sex game or for a jealous SO's who searches an original way ...