> The amount of women in stable heterosexual relationship is the same as amount of males in heterosexual relationship.
Yes, you're completely right. However (in the culture I'm in) men usually take action to ask out/talk to women. This asymmetry theoretically leads to men getting rejected until they're not, and women meeting unworthy men until they don't. So each gender has an entirely different perspective on the same dating market. Personally speaking, it is hard for me to fully understand my female friends' difficulties with dating (or friendships) because I've only experienced it as a male, so many things they have difficulty with are things I take for granted (this usually goes the other way too).
Unless there's a huge cultural shift, men and women will keep having completely orthogonal experiences and until then, empathy remains the biggest asset for us to treat each other with.
It is not binary either choice. And ideally partners have shared friends.
One of the things you learn when being in situation I describes is value of causual connections and friends. And the need to work for them in various ways.
The amount of women in stable heterosexual relationship is the same as amount of males in heterosexual relationship. If you talk about people having one night stands randomly, there is no connection except sex there.
The most lonely isolating experience I ever had was being at home with children. It may just be that this gives one training for how to deal with being alone and tilts female culture towards behavior that prevents loneliness. Plus it makes it more acceptable for woman to display behavior that prevents loneliness in long term.