Hi, I see the full picture now
Dev decided that unlimited ejaculation are too op and are too unrealistic, hence the limit of 3.
For now nothing can be done about it, but I have a feeling that dev will rebalance whole running minigame at some point in the future - enemies health, damage, item drops, money gained, etc. so the rate of dropping cum gum might increase then.
Have a nice day,
Cheers!