Yep, all cum should be shot up an ass or down a throat or even better both ways, all of it. Which is also why I hate when guys jerk off and waste the cum while they fuck. If I fuck the other guy and seed his hole I expect him to return the favour and not waste it.
Luckily these days almost every new gay porn flick is bareback. But it's a pity for these older flicks. And there are quite a few older vers performers I would have loved to see take and give dick bareback but since they don't do porn no more or have departed we will never see them seed and get seeded. Thank goodness for PrEP and the bareback sex and porn it has given us for the past decade or so. I would hate condoms in my porn so much.