Yes, there are definitely two people involved. I think the point is it's not exclusively either a 'women's' issue or a 'men's' issue. It's both, but they are interelated.
I was desperate to fall in love and settle down right through my 20s and 30s, but never made the leap in my mind to '... and then have children.' I think the reason was that all my focus was on the first part (falling in love) which I saw as a prerequisite to even considering the babies thing.
The obvious way to cope with the 'what if I never find someone?' thoughts is to steel yourself to it, and convince yourself that it doesn't really matter if you never have kids. I developed a defence mechanism in my 30s along the lines of 'kids? pah, I can't stand kids!'
So by the time I met the lovely MrP I had to be convinced to allow myself to actually feel anything clucky or maternal. It was very scary territory for me by that time! When he proposed he included the condition that I at least consider having babies. (Yes, very romantic!
)
I still believe the underlying reason for my late ensprogulation was the difficulty finding a trustworthy man with sufficient maturity, but I'll shoulder my share of the blame for the state of mind I was in when I finally did meet one.