#1 It's Too Small
A condom that is too tight will most likely tear and leak.
#2 Used With Oil Based Lubricant
Oil based lube with a condom is a big no no.
#3 It's Too Big
A condom that is too big will not create a tight enough seal to hold the contents inside.
#4 Was Damaged Between Manufacturing And Purchase
Sometimes condoms can become punctured or damaged from manufacturing, shipping, and delivery to the store you bought them in, even getting damaged in the store itself.
#5 Was Used More Than Once
Use a new condom each time you ejaculate. Never reuse.
