One question about stds.

Patient: Hi there, I’m wondering why I still can taste semen while I used a condom during oral sex. The condom didn’t leak or broke. I just a bit worry about any stds. I remembered when I was performing oral sex on my boyfriend, I used a condom, but still can taste a little salty in my mouth. But I checked the condom after, It didn’t leak or broke. So, I just wondering why, and if this experience could be considered an exposure? should I get tested after couple months? He told me he doesn’t has HIV, cause he tested it every year, but never tested other stds, cause there shows no sore or other symptom on his body.

Symptoms: No symptom