大学生恋爱与性健康作业答案_百度文库
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大学生恋爱与性健康作业答案
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要看他的ph值。　水的PH值是表示水中氢离子的负对数值，表示为： 　　PH =-Lg[H] 　　PH值有时也称为氢离子指数。由水中氢离子的浓度可知道水溶性是呈碱性、酸性还是中性。由于氢离子浓度的数值往往很小，在应用上不方　便，所以就用PH值这一概念来作为水溶液酸、碱性的判断指标，而且离子浓度的负对数值恰能表示出酸性、碱性的变化幅度数量级大小，这样应用起来就十分方便，并由此得到：...
扫描下载二维码what is a normal sex life
正常的性生活是什么样的_养生攻略_养生知识_养生信息_百度攻略
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What is a ‘normal’ sex life?什么是“正常的”性生活？ By David Robson17 February 2016 Let’s face it, human sexuality is complicated. There are probably as many different sexual peccadilloes as there are flavours of food – and like our culinary tastes, our preferences vary from country to country, individual to individual, and day to day. 让我们面对性生活这一话题，它是一复杂的行为。关于性的轻微犯罪行为种类繁多，就像食物的味道一样多种多样。和我们对事物的品味一样，我们的爱好因国家不同，个体差异，年代不同而有差异。精彩内容，尽在百度攻略：For this reason, trying to describe the “normal” sex life is something of a fool’ the variety is so great that a single statistic is never going to capture how most people feel. So BBC Future has looked at the data to try to get an idea of the full spread of the sexual spectrum – from how much we actually want sex to what we really do between the sheets.
基于以上原因， 试图描述什么是正常的性生活似乎有点像是傻子的差事。差异是如此之大，以至于没有哪一个统计数字能记录了大多数人的感受。因此，精彩内容，尽在百度攻略： Needless to say, this comes with some serious caveats. Surveys of sexual behaviour are unreliable: given that talking about sex can still be taboo, participants may not reveal the whole truth, or,conversely, they may feel the need to embellish their answers with bravado. These statistics aren’t the gospel truth, but should be read more as a general indication, given the evidence to date, of the range of sex lives in the 21st Century.精彩内容，尽在百度攻略： It’s notoriously difficult to put a精彩内容，尽在百度攻略：figure on sexual orientations: estimates of homosexuality vary from 1% to 15% depending on whom you ask, how you ask it, and whether you are examining attraction, behaviour, or identity. Nevertheless, some recent surveys from across the world suggest that some people completely lack sexual desire (which is not to say they have never had a relationship). As with other sexual orientations, the exact prevalence is unknown (most settle around 1%) but there is a growing asexual pride movement for people who lack sexual feelings. Source: Psychology and Sexuality. 精彩内容，尽在百度攻略：One misconception is that most casual sexinvolves people we’ in reality, sex comes in many shades of informality, and theanonymous one-night-stand is relatively rare, as this US survey from 2009 showed. (Although that may be slightly skewed for the younger people in their teens and 20s, the figures are not so different for those aged up to 60.) In other words, for almost 50% of the population, “it’s complicated”. Source: Journal of Sexual Medicine精彩内容，尽在百度攻略： This data was based on the Global Sex Survey in the US, which has included more than 50,000精彩内容，尽在百度攻略：respondents over the age of 18. And although frequency of intercourse drops with age, it may not be as low as you imagine. A recent survey of older citizens (average age 70 years) found that at least 50% had sex more than twice a month, with 11% enjoying regular intercourse every week. Sources: Social Indicators Research and Archives of Sexual Behaviour These figures were based on an anonymous精彩内容，尽在百度攻略：survey of nearly 2,000 respondents, aged 18-59, in the US, who were asked to say what behaviours they engaged in the last time they had sex. Source: The Journal of Sexual Medicine Although lesbian women report having sex less frequently than gay men or heterosexual couples, it精彩内容，尽在百度攻略：seems to be a case when less is more, according to an online survey in Canada and the US. Source: Canadian Journal of Human Sexuality. 精彩内容，尽在百度攻略：It’s commonly assumed that it’s only women who fake their climax – but a recent study in the US found a relatively high number of men had also pretended to orgasm at some point during a range of sexualactivities. The reason, as you might expect, was often that they didn’t feel in the mood but had not wanted to upset their partner. Despite the fact they fake itthemselves, though, only 20% of men consider that精彩内容，尽在百度攻略：their partners would do the same. Source: Journal of Sex Research 精彩内容，尽在百度攻略：
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