If this has some traffic then you can consider parking it. I do not think it is brandable. Hence, it can not be used to establish a business.
The one idea I had was X qp X which would stand for X quick pics X... so NSFW pics in a click through gallery style. There must be more ideas - just have to be creative.
In my opinion, It's very hard to try some terms using "xpqx". Perhaps end user could be interested with this one for personal blog.
If you laterally invert the domain it looks a touch phallic. That is the only thing it has going for it. A male health site/ etc similar. A bit crude but this is branding.
You could make an image host out of it or just use it as a personal blog as the URL will be easy to remember.
I completely accept this, The best thing u can do with that domain is sell that and make some $$. lol.
I think an adult type site would be best for this domain. I created a simple logo you can use if you want. Good Luck!