If you deny ejaculation for a while, you can build up a huge amount of cum.  At least, I think so.  I know for me, I abstain from ejaculating before a date.  When I do cum, it is huge.  I've had more than one girl mention it-- i.e. the amount.  I know some girls will say stuff like that to make a guy feel good, but this is like with almost every girl I've been with lately-- to include non-pros.  The best thing, all of them have taken it like a champ and swallowed every last drop.  One girl even mentioned it tasted good.