Despite emulating straight, male-dominated heterosexual behaviors, the concept of consuming one's own ejaculate is considered taboo. I strongly believe this is based in patriarchal understandings of sexual dynamics.
See, when a woman provides oral sex to a man, it's always put into the context of a "service." It's rarely considered, unless the woman is branded "deviant", to be something that she's supposed to enjoy. Even in a loving relationship between two people in an established marriage, the most picturesque representation of a soon-to-be-nuclear family, it is a hardship that she endures out of deep love for her partner. She is not allowed to own the sex in this perspective. She is not allowed to claim her actions as her own, it must be in the context of submission, debasement, and service to a male dominated hierarchy. When the act is finished and the evidence remains, it is to be consumed in spite of it's apparently distasteful nature because that is what the man should want, he should not want to see it.
The nature of male ejaculate in particular has a particular vibe. Different from other types of bodily fluids, male ejaculate is considered particularly disgusting for it's relative risk posed. Obviously there is the pregnancy risk, but in a straight relationship that's considered a beautiful, desired outcome. Even in the cases of accidents, many people look back and consider them miracles. No, it is treated outside that danger as worse than a biohazard, even when it is old and stale, and harbors no pathogens. My belief is that this is because of a lack of positive associations with it. To the man, it represents commitment, a loss of control to more base desires, and a shameful part of their biology. Men are less biological creatures, so they do not cope with their biological shame well and make society suffer for it. To the woman, male ejaculate is something that happens to her; it is the pinnacle of objectification. Denied access to ownership of the reception within dominant purity culture, it becomes exclusively a tool used against her.
Therefore, to "recycle" you are objectifying and debasing yourself, putting yourself below yourself in an undignified way in which you are forbidden from claiming. You are not yourself, you are not an object for anyone of status, you are an object becoming an object for another object. You have lost all semblance of humanity from this narrow confine. It is not an empathy building exercise, it is not a matter of cleanliness, it is most certainly not "enjoyable", it is not anything at all. You have unleashed the vile corrupting essence of a man and unleashed it upon yourself as an object-woman becoming neither, nothing, all from within yourself, and that is truly where the disgust lies. It is not that you are debasing yourself, but that the observer must come into contact with that conception. The dissonance between their well-meaning rhetoric about individual consent and safe-sex practices and their heteronormative views reaches a climax and you, the unbecome, intuitively disgusting and repulsive, are to blame.