The average woman doesn't experience an orgasm through vaginalsex alone.
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STIs can be caught when people have unprotected oral, anal and vaginalsex.
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Menopausal women should have vaginalsex on a regular basis.
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You get it by having oral, anal or vaginalsex or sexual contact with someone who is infected.
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Teenagers may be at particular risk given the widely held mistaken view that oral sex was safer than vaginalsex.
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As a result, anal sex is 30 times more risky for HIV transmission than vaginalsex according to the CDC.
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Unprotected anal or vaginalsex increases the risk of HIV infection, as well as syphilis, herpes, chlamydia, gonorrhea and bacterial vaginosis.
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Anal sex with a female was associated with having five or more lifetime female sexual partners for oral and vaginalsex.
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Adolescents who tested STI-positive reduced their number of vaginalsex partners and the probability of unprotected sex over the first 6 months.
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In total, the data covered 8,856 instances of vaginalsex between men and women that included condoms.
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If anything, they were more of a thing that good girls did to avoid being "bad" girls by having vaginalsex.
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Cases were clustered in autumn and winter of each year and all reported recent insertive oral sex and seven reported recent insertive vaginalsex.
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The belief that oral sex was being practiced more and vaginalsex less to avoid pregnancy and STDs has gained traction in recent years.
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There is also an increased risk of infection of the anus and rectum if the couple switches back to anal sex after vaginalsex.
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Studies have shown that 75% of women do not orgasm regularly from vaginalsex and need more than penetration to reach a climax.
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A study in this month's BJOG:An International Obstetrics and Gynaecology Journal, found that by six weeks 41% of first-time mothers had had vaginalsex.