4 ms·> up to 100% effective That doesn't mean anything, 0% is included in “up to 100%”.by noname120 1y ago> up to 100% effective That doesn't mean anything, 0% is included in “up to 100%”.Leftium 1y agoI think the stat was hedged because of this, further down: > ...100% effective when used perfectly, and 92% effective for typical use.IAmBroom 1y agoThat's still highly optimistic. Sperm can apparently live for days inside a woman in some instances.