Why does this begin?

when i have oral sex, my throat become very irritated. why is this. (mature answers one and only please).Why does this begin?
Does this happen normally? I also assume you're a girl? If so, you may want to check your partner(s) personal hygiene particularly concerning his genitals because not adjectives guys care roughly speaking how clean their parts are. This leaves germs surrounded by your mouth that can travel down your throat giving you that irritation. STDs just receive matters worse as they will also bestow you a nasty infection.
Personally, I wouldn't want to mete out that problem. =)
try to check your partner. have both of you screen from STDs. he/she might have trichomonas infection.