People can remain infectious with some stis even after the symptoms have disappeared .

甚至在性病症状消失之后，人们仍然会感染上一些性病。

These condoms , or " skins , " are effective in preventing pregnancy , but not in preventing stis or hiv transmission .

这些套套，或者说“表皮”，对于防止怀孕有效，但无法阻止性病和艾滋病的传播。

Urban and deprived areas have the highest rates of stis .

城市和贫困地区的性传播感染的比例最高。

Now , american parents would like their teenagers to be taught that the only surefire way to avoid pregnancy and stis is abstaining from sex because that 's the truth .

如今，美国的父母都希望教育青少年们，禁欲是唯一并且万无一失的能避免怀孕和感染性病的方法因为这是事实。

Condoms also provide some protection against herpes , syphilis and chancroid , but genital ulcer stis can also be transmitted by contact with exposed infected skin .

避孕套也提供了一些保护以防止疱疹、梅毒和软下疳，但是生殖器溃疡的性病也能通过与受感染的皮肤接触而传染到。