A very small chance of that happening; not many things survive the hydrochloric acid in our stomachs...
At the time I never even thought about the possibility of getting an STD. He was married and not out running around so I felt safe enough to swallow his load.
For me, once I got a taste, I was wanting a man's load of cum almost daily and many days was swallowing upwards of four guy's loads of cum. I was quite the cum slut back in the day.
Not really. I've sucked off a lot of random guys. 0 STD's so far. I do limit my activities a bit. No more glory holes for me although they are my favorite thing. Risk exceeds reward.