I recently deleted a competition initiated by a user on this site. I have extremely mixed feelings since:
We love when users show initiative on our sites. In this case, there was a major award and it a continuation of a successful contest the previous year. That's awesome!
However, the image chosen this year was not the best choice. I don't think the photo was chosen maliciously. As a standalone, there's nothing particularly offensive; it's clearly a stunt from the early days of robotics. But in the context of a caption contest, it lends itself to innuendo that we don't really want this site to be associated with. The early submissions have already veered off into creepy territory.
We hate to be grinches, but I'm shutting the contest down until a more appropriate image is found.
As an aside, diversity in the technology industry is something Stack Exchange tries to encourage. In a male-dominated industry, we need make our workplaces more comfortable for women. My previous employer encouraged women to cross-train as DBAs, for instance. I'd be curious to know how your workplace has handled the issue.