I'm a HUGE cocksucker. just check out my blog.
But that said, I'm not necessarily a huge swallower. I always want the guy to cum in my mouth. If I want to taste his cock I'm gonna want to taste his cum. No doubts there. But it's relatively rare that I actually swallow the load.
When do I swallow? No hard and fast rules. Mostly I've got be into the guy. And that's fluky. I sppose the best overall indicator: would I want to go a second or third round? Then I'll definitely swallow. One thing that doesn't make a difference: taste. Weak or strong tasting, if I'm into the guy I'll swallow. I've never, in that situation, been put off just because the dude's sperm tastes bleachy or chemical laden. Indeed, I think that kinda spurs me on, if anything.