Finally found
I was mulling over that perennial plaint that gurlzz and wymynn write about Teh Lurrhve because they are either not interested in the Big Important Subjects of Life or because they are all about Warm Caring Nurturing Emotional Stuff and therefore love falls into their sphere of interest.
And I remembered a poem which I have finally tracked down, by, of all people (I am hedgehog, hear me boggle), Kingsley Amis, which suggests rather more, not exactly sinister, but far less cuddly-bunny reasons for this gender imbalance in writing, specifically poetry, about love:
Something Nasty in the Bookshop (third poem down, and I'm loving the allusion to a female writer's immortal phrase).
The poet picks up a new anthology. At first he simply notes the contrast between men writing about Big Important Impersonal Thinky Stuff About the Big Wide World, while the women are writing far more personally and romantically.
But then he goes on:
Man's love is of man's life a thing apart;
Girls aren't like that.
We men have got love well weighed up; our stuff
Can get by without it.
Women don't seem to think that's good enough;
They write about it.
And the awful way their poems lay them open
Just doesn't strike them.
Women are really much nicer than men:
No wonder we like them.
Deciding this, we can forget those times
We stay up half the night
Chock-full of love, crammed with bright thoughts, names, rhymes,
And couldn't write.
Obviously there are various readings of this, but one possible one, it seems to me, is that women are just much tougher than men about eviscerating the human heart - the men wimp out.