A panel of scientists at the US National Institutes of Health has confirmed what health experts have known for years: The proper use of condoms dramatically cuts risks for sexually transmitted gonorrhea and HIV.

But because of a paucity of research on the condom’s effectiveness in preventing other sexually transmitted diseases (STDs), the panel said it remains unclear just how useful condoms might be in preventing the spread of infections such as human papilloma virus, genital herpes and syphilis.

After reviewing a total of 138 studies, the panel of scientists, convened at the behest of Congress, conclude that men who said they “always” used condoms during sexual intercourse reduced their risk of transmitting HIV to either a male or female partner by 85%.

Consistent condom use was also credited with reducing risks for gonorrhea infection by between 49% to 100%, according to the panel.

However, published data is “insufficient to draw meaningful conclusions” regarding the effectiveness of condom use in preventing a group of STDs characterized by genital ulcers–such as syphilis and genital herpes, the experts say.

It is also unclear how effective condoms might be at preventing transmission of human papilloma virus, which causes genital warts and is also strongly linked to an increased risk of cervical cancer.

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