If that's your plan you will probably have to rely on bootstrapping or non-startup investors. VCs don't invest in porn or largely porn-related businesses generally.
And if that's not your plan I would generally think the idea is unlikely to work. Paid non-porn fan clubs seems like an exceedingly small niche (in the US). I doubt I know anyone who has a paid subscription to anything like this.
Anyone can have fans, as is represented by the 38,000,000 active fan pages on Facebook (34 million of which aren't businesses or brands). Unless there are 34 million porn stars looking for fan clubs, clearly our business wouldn't be solely based on sex.
Then again, I'm sure Tumblr thought the same thing... they're majority porn.
Thank you for your feedback though.
That is the definition of a porn site and little else. Your market size is not the number of people who have fan pages on Facebook. Your market size is the number of people who want paid subscription fan clubs off Facebook. That's a very much smaller number. I would recommend not using the FB number because no intelligent investor will buy it.
You will have to prove there's demand, that isn't porn, for VCs to be interested.
If you think there is non-porn demand I would highly recommend swapping out the sexy model for a more "family friendly" example.