This is a term use in the adult industry and is usually referred to a porn website with a similar interface to YouTube; these are the most popular form of porn available on the internet.

Some advantages of tube sites are that video content is in formats that are easily played in almost any smart device; you can make extra money out of it by including in your tube site pop-up advertisement, referrals, gated content and more. Also, there are a lot of free and paid tools to create and process content for your tube site.

Some disadvantages that you may get in this niche is competition, yes there are hundreds of tube sites available on the internet… so in order to get any profit you will need to step up your game. Since this particular type of porn site is so popular, you will need to spend a significant amount of money on advertisement to let the world know that your content is the best.