To actually monetise it I'd be tempted to go down the route of adult games, party games, cocktails, gifts, toys and holidays.
Agree with Scott, I'd just add dating to the list.
Holidays might be quite promising. Focus exclusively on tours, packages and destinations that are over 16s/over 18s only i.e. kids not allowed. I'd love to be able to refer to a site like that.
The ideas I was thinking have already been mentioned, but you could add adult education to the list. Don't know anything about the industry but will assuming it will rise in demand in future so those without qualifications can keep up with those that do.
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