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N an act of sexual intercourse or sodomy performed without the use of a condom, thus involving the risk of sexually transmitted diseases 无防护措施的性行为
You are playing Russian roulette every time you have unprotected sex.
每次你进行无保护措施的性爱都是在冒不可预料的风险。
《柯林斯英汉双解大词典》
In any event, the notion that impetuous Italians have unprotected sex is false.
ECONOMIST: Why Italians don��t make babies
It's a fact that rates of unprotected sex do not increase when there is more access to emergency contraception.
CNN: Morning-after pill a boon for women
Another concern among some is that access to emergency contraception will increase the rates of unprotected sex, especially among teens.
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