推荐文章：与狗相关的谚语Dog Proverbs and
推荐文章简介：
Dog Proverbs and Sayings与狗相关的英语谚语和短语 He is a lucky dog. 他是个幸运儿。lead a dogs life 过穷困潦倒的日子 not have a dogs chance 毫无机会 top dog 当权派；头儿 treat sb. like a dog 不把某人当
res and are therefore not recommended for disease prevention. On the other hand, laboratory studies have consistently demonstrated that latex condoms provide a highly effective mechanical barrier to HIV.
In order for condoms to provide maximum protection, they must be used consistently (every time) and correctly. Incorrect use contributes to the possibility that the condom could leak or break. Proper use should include the following:
- Put on the condom as soon as erection occurs and before any sexual contact (vaginal, anal, or oral).
- Leave space at the tip of the condom.
- Use only water-based lubricants. (Oil-based lubricants can weaken the condom.)
- Hold the condom firmly to keep it from slipping off and withdraw from the partner immediately after ejaculation.
When condoms are used reliably, they have been shown to prevent pregnancy up to 98 percent of the time among couples using them as their only method of contraception. Similarly, numerous studies among sexually active people have demonstrated that a properly used latex condom provides a high degree of protection against a variety of sexually transmitted diseases, including HIV infection.
Condoms are classified as medical devices and are regulated by the Food and Drug Administration. Each latex condom manufactured in the United States is tested for defects, including holes, before it is packaged, and several studies clearly show that condom breakage rates in this country are less than 2 percent. Even when condoms do break, one study showed that more than half of such breaks occurred prior to ejaculation.
Latex condoms can provide up to 98-99 percent protection against pregnancy and most sexually transmitted diseases, including HIV infection, but only if they are used consistently and correctly.
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