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Some, in particular HIV and syphilis, can also be passed in other ways, including from mother to child during pregnancy and childbirth , through blood products , and by shared hypodermic needles. Another study by the Kinsey Institute sampled people, ranging in ages 18— Reconstructive surgery remains an option for women who have experienced benign and malignant conditions. It has been linked to atypical levels of dopamine, a neurotransmitter. Coitus interruptus There are a variety of safe sex methods that are practiced by heterosexual and same-sex couples, including non-penetrative sex acts,   and heterosexual couples may use oral or anal sex or both as a means of birth control. Infants born to mothers with untreated gonorrhea or chlamydia can develop neonatal conjunctivitis a serious eye infection , which can lead to blindness. It is sometimes performed to the exclusion of all other forms of sexual activity, and may include the ingestion or absorption of semen or vaginal fluids. Lerner and Laurence Steinberg state that researchers also "rarely disclose how they define sex or even whether they resolved potential discrepancies in definitions of sex".
Millions of sperm are present in each ejaculation, to increase the chances of one fertilizing an egg or ovum see sperm competition. But he didn't ask if the men or their partners considered two minutes mutually satisfying" and "more recent research reports slightly longer times for intercourse". This is especially true for women. Syphilis can result in stillbirths and neonatal deaths. When a fertilized ovum reaches the uterus, it becomes implanted in the lining of the uterus the endometrium and a pregnancy begins. Human papillomavirus can lead to genital and cervical cancers. Some, in particular HIV and syphilis, can also be passed in other ways, including from mother to child during pregnancy and childbirth , through blood products , and by shared hypodermic needles. Sexual functioning has been regularly identified as a neglected area of the quality of life in patients with rheumatoid arthritis. Infants born to mothers with untreated gonorrhea or chlamydia can develop neonatal conjunctivitis a serious eye infection , which can lead to blindness. For gay male pairings, there is the option of surrogate pregnancy; for lesbian couples, there is donor insemination in addition to choosing surrogate pregnancy. However, doctors caution against the unnecessary use of these drugs because they are accompanied by serious risks such as increased chance of heart attack. The study considered China and Vietnam to also fall into this group, though data were not available. It is manifested by hypersomnia and hypersexuality and remains relatively rare. This data includes live births, abortions, and fetal losses. Human mating strategies and Pair bond Copulation ranges from a purely reproductive activity to one of emotional bonding. Reconstructive surgery remains an option for women who have experienced benign and malignant conditions. They added that "several co-factors may increase the risk of HIV transmission through oral sex"; this includes ulcers, bleeding gums , genital sores, and the presence of other STIs. Those seeking treatment will typically see a physician for pharmacological management and therapy. Copulation corresponds to a succession of innate sexual reflexes: Artificial insemination is a form of assisted reproductive technology , which are methods used to achieve pregnancy by artificial or partially artificial means. The subsequent route of the sperm from the vault of the vagina is through the cervix and into the uterus , and then into the fallopian tubes. Condoms are widely recommended for the prevention of sexually transmitted infections STIs. Untreated chlamydia infection can lead to female infertility and ectopic pregnancy. The term coitus is derived from the Latin word coitio or coire, meaning "a coming together or joining together" or "to go together", and it describes a variety of sexual activities under ancient Latin names, but usually refers exclusively to penile—vaginal penetration. When a fertile ovum from the female is present in the fallopian tubes, the male gamete joins with the ovum, resulting in fertilization and the formation of a new embryo.
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