As #COVID19 cases rise, I see a lot of discussion about #quaranteams or #socialbubbles, and what kind of socializing is safe. I think of social bubbles in terms of birth control - there's a HUGE difference in effectiveness between "perfect use" and "typical use".
"Perfect" use of condoms is 98% effective at preventing pregnancy. This means using a condom correctly EVERY time you have sex. Unfortunately, to err is human. The condom breaks, falls off, or isn't the right size. Typical use effectiveness? Only 87%.
https://www.bedsider.org/methods/condom
https://www.bedsider.org/methods/condom