blowjob to handjob :)

does anyone give their bf, dh, or so a blowjob until he's going to cum, and you finish him off in your hand? i really luv giving my bf head, but im not crazy about his cum. sometimes i like it when he does cum in my mouth and i dont really mind the way it tastes, that's ok. i just can not seem to be able to swallow it. like i said the way his sperm tastes doesn't bother me, but the way it smells:( there's much to much of it! and it's so buggery like snot, it makes me gag if it hits the back of my throat, sooo i switch to jacking him off when he cums. is there anyway to control the amount of cum, or so it doesn't hit the back of my throat? maybe if i let it collect on my tongue i will then be able to swallow it? i don't know... anybody have any advise or tips for me, or might do the same thing? i'd be curious to know. also how do i deep throat?