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Are spermicide condoms effective

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PIP: The topic of this paper is the demonstration of the combined effectiveness of condom and spermicide use. It is reasoned that 2 methods, which separately provide only moderate efficacy, act together independently and the probability of both failing is the product of the 2 probabilities of failure. Under perfect use, where there is correct use for every act of intercourse, the assumption of independence is very likely, and efficacy would be a high as steroidal implants. In addition to highly efficacious protection from pregnancy, there is protection form HIV and other sexually transmitted infections STD. Condoms are defined as good quality which resist breakage and conform to the International Condom Standard,
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Condoms with spermicide: Do they work?

Are spermicide condoms effective
Are spermicide condoms effective
Are spermicide condoms effective
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Spermicide Condoms: Are They Any More Effective For Birth Control or STD Prevention? | Men’s Health

It also kills the sperm itself. Spermicide comes in several forms and is placed deep into the vagina shortly before sex; the active ingredient in spermicide is called nonoxynol When used alone, spermicide is only around 70 percent to 85 percent effective in preventing pregnancy. It does not prevent sexually transmitted infections STIs. To boost protection from pregnancy, it is best to use spermicide in combination with a diaphragm, condom , or cervical cap. Using a condom also prevents STIs.
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Spermicide

Some contraceptive methods work by creating a barrier that prevents sperm from entering the uterus. These methods are permitted by some halachic authorities under certain circumstances. Condoms are not permitted, although an individual question can be asked in very extreme circumstances.
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You are standing in the grocery store staring at the overwhelming selection of condoms. The last time you had sex there was an unfortunate incident involving breakage and you are eager to avoid the pregnancy panic and STD scare that ensued. You look at the condoms with spermicide thinking that extra-protection sounds like a good idea right now. Condoms with spermicide must be even better, right? So ditch the condoms with spermicide.
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