It definitely works, and there is a lot of people who do it. The only thing with this is, that you need to find right traffic sources / companies. If you get if from random places, it will not work. There are websites, who sepcialize in something like this. Find them all, talk to them, and they will tell you what is what.
Another thing is how to do it (maximize roi), and possibly profit (buy traffic, make the money back and profit on the top of this, the way it works with regular advertising - this is exactly the same way it should be working here).
There is some media buying resources on the Net, I've seen a Facebook group, also adult media buying forum (I am not sure if it is good / worth it, it is paid). Buying traffic is a separate specialization, and it takes time to figure it out, and do it right.
But as far as your question, definitely yes. Start from talking to people who run the traffic selling sites.
# # # Edit
You need to be good with Analytics / Google Analytics for this, so you know exactly what you are doing, and whether you benefit or not. You dont just buy and hope for the best. You need to actively work on it, analyze the results, keep optimizing incoming traffic for the best roi for the lowest amount of money paid.
I would: a) learn Google Analytics (very good), b) find the best companies for xxx paysites traffic c) talk to them, and they will tell you what to do, and how to do it, especially / if you spend money at their sites.
Some of the sites you may want to look into for this are
Ero-Advertising (they will help you and give you good advice, regardless of the amount of money spent),
Exoclick (you need to be a "big fish" there to get help, if not you need to test and try everything by yourself, but their system is very good),
Juicy Ads (they will explain you everything very good too, regardless of the amount of money spent). As good, or even better for this will be smaller xxx advertising sites.
Not all of them here, but some can be good