system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If bathroom hygiene is so important why don't we get sick after performing oral sex?
gpt
It's more a matter of frequency. If you consider all the times in a day you touch a person (shake hands, etc.) or touch something they touch (doorknobs, etc.), it ads up to a lot of exposure. 

If you sucked that many dicks, every day, from that many random people, you would probably get sick a lot.