Dude... the porn industry and amateur porn industry are one in the same.
You will eventually run into issues with a payment processor and/or have to accept the terms of service of whatever advertising network you join.
But lets just ignore all of that for creative purposes and make believe for a second.
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Since you are talking about a tube site (featuring content that has already been created and likely passed regulations) how about you focus on making creative marketing content to get people's attention. Alot of people get fucked up and mindlessly stare at YouTube. That could be an option but be prepared to have it flagged within hours. Maybe going to some drug forums and plugging it there?
Go to a club and sometimes after 1 or 2 am drop a bunch of cards with the URL.
Maybe big letter that say "FREE MOLLY" and small print says "porn"
Litter that dance floor with your spam in the hopes a few of the molly heads will go home and jack off to it.
Hell....maybe even get involved with some DJs or whatever and have them rep you.
Back to reality....
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Drug usage is bad and a sure way to get LE interested in anyone promoting it to the masses.
Risk versus reward I guess.
Joe Francis did pretty well for himself, until he had to bounce out of the country and never come back.
In the meantime....watch this video. Pretty funny shit.