Case men's live expectation is significantly less than women's in the first world (look up Pakistan to compare). So you don't need a lot of additional discrimination not to pay men any pension to speak of - statistically. Men's rights aren't protected too. Just you try to rob women of their money in so obvious and discriminating way...
https://disqus.com/home/channel/saywhateveryoulike/discussion/channel-saywhateveryoulike/state_pensions/#comment-4368223066