You can get any STD through oral sex. Yes, HIV/AIDS included. Most STD's are exchanged through body fluids. Yet, others are exchanged through direct contact. Some STD's don't have any signs or symptoms, so just by looking at his genitals, you can't see whether or not he has one. Even if he didn't ejaculate into your mouth, I'm sure his pre-ejaculation did; even if you didn't notice. Pre-ejaculation is the fluid that comes out of a penis when he becomes sexually aroused or right before he ejaculates. Pre-ejaculation can carry a numerous type of STD's, but the chance of you getting a disease is very slim. HIV/AIDS can be transmitted, but I read somewhere that the chance of getting HIV through oral sex is less than 1%. So, besides herpes and HPV, getting an STD through oral sex (without him ejaculating in your mouth) is very slim (but possible). In the future, use protection. It will save you the worry. Sorry, but I don't know much about hepitis and how it is transmitted. Hope this helps and the best of luck to you!