WebPagePromotion.com competes with the (IMHO) better domain WebSitePromotion.com. Same amount of letters, but yours is substantially less common. I would rate it at around $75.
TeenCockSuckers.com. Sounds like it could arouse some interest. Could be a winner there. A bit longish, but could possibly net you around $1k. "Cock" tends to imply a gay site, and those aren't as popular as others.
Unfortunately, ( and we could all be using some standard name for this particular valuation I feel ) I would value that domain at the lowest reg. price. The best usage I can think of for it is completely administerial (e.g. the name of a nameserver). It doesn't make immediate sense, and its a .NET as well. PORNSTOP.COM or PORNZONE.COM would read much better. Believe it or not, there are many people who do not recognize the word "PARK(s)" as a noun. Worse, it is a plural, which is harder to visualize. Were it longer, like SUNDAYMORNINGPORNINTHEPARK.com, it would even be of a lower value than a reg fee.
I'm surprised PornParks.com did not pick that up just for completeness. I personally do not know what you could do to foment confusion (and increasing your traffic) from that. I'm guessing that people are bookmarking this website directly, or clicking a link to get to it. I doubt its getting any random type-in traffic or high search engine searches.
Alexa (and its service model) has a high potential for misleading any determination regarding domains to purchase based on popularity or rank.