Welcome to HCM,
Your question is about possibility of STDs through oral route, the answer is yes there is possibility as you do not the status and he or she may be carrier. These are bacterial, Viral, and fungal.Herpes
, Chlamydia, HPV
You must understand she/ He may look clean, it is better to prevent then to regret.Avoiding sexual contact, for health or moral reasons
That is why it is very important to practice safe sex
, please take care of personal hygiene.
Please restrain yourself for oral sex
and it at all you go for it take care and practice safe sex like using condoms which reduces chances of STDs.
Please take care