In Alt World, I amuse myself by putting former FWB's and myself in a 'Do-Over' where we all get to practice the Primal Urge with some abandon, not being constrained by societal rules.
One of the squiks that arise, besides my annoyance at being treated like a piece of male-meat, is the discovery, during writing it, that my female friends in this fiction tend to fixate on my semen.. and how much they can get of it.
This didn't come out of the blue.. it's based on fact. Gerri and Carole, in particular, were vocal in that viewpoint. But a hint could have been that none of the girls rushed to 'clean up' after coitus.
Since there's nothing in fiction that's not reflected somewhere in fact, this news story out of Detroit:
Not 'enough cum' raises woman's ire.
Like one commenter said "Talk about performance anxiety"
Not to mention volume drops somewhat with age, as I can attest.