I'm in the UK and have my own paysite, and I'm considering closing it down because if I have to set up age verification, I'm just not going to be able to afford it. The age verification solutions I'm aware of at the moment (the biggest one is MindGeek - owners of pornhub, etc) all charge significant amounts (from 50p - £1.50) to age verify. And you will need to age verify *every* visitor to the site, not just visitors who join, so unless you're charging huge membership fees, or have a very large paying membership, it's going to be very difficult to not make a loss.
However, until the BBFC releases their guidelines, it's going to be hard to tell what services are going to need to be behind age verification.
If you want to read more about the details, Pandora Blake (
http://pandorablake.com/blog) has written about it quite extensively, and has a good list of other resources to read
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