With regards to Men's Sheds, the organisation was started as a place for men to have a place to go to make things (carpentry, metalwork, art etc.) in a male only environment due to a lack of places to go to offload any worries, concerns, anxieties, bereavement, loneliness. Not all men go to the pub or sports venues for friendship and camaraderie, retirement means many men no longer have the company of workmates to chat to, have a laugh with, so Men's Sheds filled a need for lots of men. Men could talk freely, no doubt offloading about domestic life, wives, girlfriends, family life in general, happiness, sadness, general health, mental health, bereavement, loneliness. Enter women into that environment and the whole atmosphere changes.
Let the men have their 'men only space', there's enough publicity about men not talking about mental health and feelings, well Men's Sheds were a provision for this and then the women started turning up. Many men will clam up around women, thus defeating the object of having an outlet for men to spend a few hours in a men only environment. The sexes are not the same, physically, mentally or emotionally. Men are from Mars, Women are from Venus. There will always be exceptions, but on the whole I believe this to be true.