Sushi, poké, ceviche, caviar, and steak tartare are all considered delicacies. Those are all dead meat that has begun to decay. The Maasai people who drink blood are perfectly healthy also. Maybe it's not the dead meat that is why people have the problem with it.

I think the comparative reasonableness of drinking semen is a facet of the normalization of male sexuality, where female sexuality is othered and taboo. Due to the upswing in testosterone during the premenstrual period and the first day of menses, many people with vaginas have a higher drive for sex during that period. Instead of normalizing that, it is shamed and made taboo. I think that is cultural, since so many cultures have raw delicacies and simultaneous period taboos.