SMART!
Brings memories of National Lampoon magazine which was very popular, and John Byners's show 'Bizzare' which featured cable-type programming 10 years before cable existed. Each had LONG runs.
Difficulties: producing a great deal of exclusive content, because as mentioned, this niche hasn't been developed. Also, finding keyword search volume. And traffic brokers don't have targeted traffic in this (as of yet, non-existent) niche. Finally, adult traffic has been so segmented by niche, could be difficult for tgps/mgps to appropriately categorize a new niche. So how would you generate targeted traffic? If you can do that, (and convert it

) you own the niche.
In short, this is no small undertaking.. but could payoff BIG. I'd focus on brand position and patience.
Good luck to you, and way to be opportunistic (in the good way)
Great thread.
