I love giving blowjobs and I do swallow.
I did it the first time by accident actually, it just shot to the back of my mouth and down it went. I just kind of kept doing it after that first time
Since I've had a few partners now, I have to say... some guys have bad tasting semen. It's not common in my experience, but sometimes it is and I'll let some spit out in that case.
My boyfriend is actually totally fine for me.
I used to date a guy who practically only ate this one meal from Carl's Jr (westcoast thing I think)... And his semen tasted awful, like straightup bitter pills mashed together. In that instance, I wasn't eager to swallow and rarely did.