Most covenants cover permanent changes to property. I have never come across one (and that's not to say they don't exist) that has language about what is obviously a temporary thing. Like an inflatable snowman at Christmas time. Of course, I suppose many (most) folks would find a display of profanity as offensive, even if it were temporary. Maybe a display on Valentine's Day....ya know, "I'm the love machine!" Something pornographic.... I can see an HOA getting up in arms about that.

I can certainly see an HOA setting dates, like Christmas decorations can be up from December 1 thru January 6 (the official 12th Day of Christmas).