Yet, there must be evolutionary advantage in sex with a partner.

In 3009 clinic STD patients, there were 4 people whose HIV antibody was electropositive. The STD infection ratio was 84.7%, 37.6% of them had more than one sex partner.

3009例性病门诊就诊者中检出4例HIV抗体阳性，性病感染率为84.7%，37.6%的人有多性伴。

Sexual risk behavior was determined comprehensively by factors at individual, sex partner, family and community level as well as health care services.

HIV感染者的危险性行为与个人，性伴、家庭和社会支持以及医疗卫生服务等多种因素有关。

Conclusion Some risk factors as casual attitude toward sex, multiple sex partner, commercial sex, same sex and bisexual behavior, and low self-protection and disease prevention awareness put students at risk of abortion and STD/ HTV infection.

结论大学生性态度开放，多性伴、商业性行为、同性和双性性行为以及防病意识和自我保护意识差等使大学生处于流产、艾滋病性病感染等危险之中。

In the life must pay attention to health, sex partner and their health please away from sexually transmitted diseases.

在生活中一定要注意性生活卫生，为了伴侣和自己的健康请远离性传播疾病。

Investigation on Sex Partner Notification and Influence Factors among Male STD Patients

男性STD患者性伴侣通知意愿调查分析

58.01% of them had more than 2 sex partners in recent 12 months while only 17.63% used condom with the last commercial sex partner.

在最近12个月中，至少有2个性伙伴者占58.01%；

We are attracted to our friends from a universal standpoint because they serve as companions as an opposite sex partner would to its mate.

从普遍的观点来看，我们受朋友的吸引是因为他们作为同伴和一个与其结合的异性伴侣一样。

Seaside motels and sex on the beach.

海边旅社和沙滩前的亲热。

Fine! I' ll have a sex on the beach.

好吧！我要在海滩上做爱。

Trinny: I know the drink for you. Sex on the Beach.

崔妮：我知道你该喝什么。情色海滩。

Sex on the beach, wanna try for a baby.

海滩上的性爱，是为了生小孩。

When I flirtatiously asked him what his favorite drink was, he said Sex on the Beach and asked if I'd heard of it.

我故作轻浮地问他最爱喝什么，他说“性爱沙滩”，并问我听说过没有。

In 2008, two Britons accused of having sex on the beach got three months in jail, though their sentences were later suspended.

2008年，两名英国人因被指在海滩公开性关系被判三个月监禁，但之后获缓刑。

Warning: This title contains scorching sex on the beach, in the shower, in bed, and against a wall.

警告：此标题包含烈日在沙滩上的性别，在淋浴在床上，并在墙上。

Sex on the beach, United States

海滩寻欢，美国

Cleveland police now say they are done searching the home of a registered sex offender.

克里夫兰警方称他们搜索了一名性罪犯的家。

The Research of the Sex Offender's Registration and Information Disclosure in the United States

美国性犯罪者登记和信息披露法研究

Who would live with a sex offender?

谁会跟一个性犯罪者住一块？

A sex offender is a person who has been criminally charged and convicted of a sexual offense, or has plead guilty but not convicted.

是指那些在刑法上被指控或证明犯有性侵害罪的人，或者是虽未证明有性侵害罪但已服罪的人。

Had they known he was a sex offender, they would have told their daughter to stay away from him.

如果他们一早知道对街邻居的性侵犯史，就会教女儿有所防范。