Here you will find our tightest condoms. We always nag about how important it is with the right size. And it's not just because the sex is going to feel better, but also because the condom should not come off during sex. How the condom is sitting depends not only on the circumference - but also on the anatomy. For example, those who have a cone shaped penis may need a condom that is a little tighter to prevent the condom from rolling up.