Pre-ejaculate can come into contact with the mouth during oral sex. The useful health question is not simply whether it is swallowed; it is what exposure occurred and which infections may be involved.
Oral sex is not risk-free
The CDC explains that oral sex can transmit several STIs and that people can have an infection without symptoms. Risks vary by infection and activity; the risk of HIV through oral sex is little to none, while other infections can still spread. Condoms and other appropriate barriers can reduce risk.
Swallowing or spitting should not be treated as a dependable way to undo contact that has already occurred. Nor does a partner looking well, being familiar, or describing themselves as “clean” establish their infection status. That last word is also an unhelpful way to talk about people with infections.
Have a practical conversation
Discuss testing, recent partners, and the protection you both want. A sexual-health clinician can advise which tests are appropriate for the actual exposures and when to take them. A test result needs context; it is not an unlimited guarantee for every future encounter.
If you are worried about a recent exposure or have symptoms, seek individual advice promptly rather than trying to calculate certainty from a blog. Explain what contact occurred without euphemisms that obscure the question.
Preference is still a separate matter
You can dislike fluid contact even after discussing health precautions. You can also change your mind. Nobody needs to turn a preference into a medical argument to have it respected.
For the non-medical conversation, see preferences around ejaculation. For why the amount of pre-ejaculate varies, see the separate physiology article.
