In BC's experience, it's only when you're married and it's too late that you realise there are binders full of single women doing nice grown-up things like going to pop-up restaurants together, which would never occur to single men to do.
Julie, of Eat Meet Supperclub highlights the problem - their singles event is short of men:
Requirement is: ability to eat food. Ability to be mildly sociable. 30-40ish (though we're not strict). Male. It's not a horrid forced fun 18-30 holiday esque singles thing... it's incredibly informal and relaxed. No tortuous party games. Oh, and there will be complimentary booze to loosen the mood. Email firstname.lastname@example.org