Could you get a infection in your throat from having oral sex? if so how?

Absolutely!: Gonorrhea, herpetic stomatitis, human papilloma virus are the more common ones. The recent significant rise of oral cancer in non-smokers is related to human papilloma virus infection via oral sex!

Yes: Semen can transmit gonorrhea and hpv. It's also possible to get oral herpes if there's an infection on the genitals. To reduce the chances of infection, use a condom.