Editing Contraceptive sponge (section)

==Effectiveness==
The sponge’s effectiveness is 91% if used perfectly by women who have never given birth, and 80% if used perfectly by women who have given birth at least once, Since it is hard to use the sponge perfectly every time having vaginal sex, its real effectiveness can be lower, and it is advised to combine sponges with other birth control methods, like [[Coitus interruptus|withdrawal of penis before ejaculation]] or [[condoms]].<ref>{{cite web |title=How effective is the sponge? |url=https://www.plannedparenthood.org/learn/birth-control/birth-control-sponge/how-effective-sponge |website=[[Planned Parenthood]] |access-date=2022-09-14}}</ref>