Semen archetypally goes into someone else's body anyway, so you could make a case that drinking it is less of a big deal than drinking a fluid that wouldn't normally be going into your body at all?
I think a lot of it is also the actual act of ejaculation, though. Contrary to what feotakahari said, I imagine that if people ejaculated blood when they orgasmed, there probably would be more norms around swallowing it.
Possibly also people are reminded of having mouth injuries when they taste blood, whereas there's no other situation where you'd be tasting semen? That one's a bit of a stretch, though.
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Semen archetypally goes into someone else's body anyway, so you could make a case that drinking it is less of a big deal than drinking a fluid that wouldn't normally be going into your body at all?
I think a lot of it is also the actual act of ejaculation, though. Contrary to what feotakahari said, I imagine that if people ejaculated blood when they orgasmed, there probably would be more norms around swallowing it.
Possibly also people are reminded of having mouth injuries when they taste blood, whereas there's no other situation where you'd be tasting semen? That one's a bit of a stretch, though.