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26

Let's get a few things out of the way... Sex is normal (1). Sexual desire and arousal are normal (2). Asexuality is normal (3). Masturbation is normal (4),(5). There is no problem whatsoever with these three things, although everyone blushes when they talk about them. Is Masturbation healthy? Downsides: Masturbation is not risk free. It is about as dangerous ...


17

Assuming pregnancy takes place, the only reliable sign that a woman is pregnant is cessation of her menstrual period. If she's late, urine tests are a reliable way to confirm pregnancy, especially if the woman has irregular periods. Up to 50% of women will not experience nausea (the range, depending on the study, is 15-50%); while most will, when they do ...


9

The CDC lists two: complete abstinence, and being in a long-term mutually monogamous relationship with an uninfected partner. Sexual intercourse naturally introduces microtears (small tears in the the epithelial layer) through which diseases can transfer between partners. One might think that additional lubrication would help with this, but the jury is ...


9

This is an interesting question, which comes frequently on Health SE. First, here a small background on vaginal secretions: More than 30 compounds have been described in the vaginal secretions. Several "sources" for those secretions have been indentified: vulvar secretions from sebaceous, sweat, Bartholin and Skene glands, secretions from the endometrium, ...


9

To get even close to how much bacteria there are in vaginal discharge and penile discharge, we look at how are they diagnosed/detected laboratory wise. Gonorrhea is caused by Neisseria gonorrhea a gram-negative diplococcus that is found in the discharge with pus seen in microscopy after gram staining. There are other microorganisms that are gram-negative ...


8

The literature regarding the use of sex toys in women is sparse. I have found two studies, which describe potential side effects related to the use of sex toys in women: Transmission of sexual transmitted disease due to the use of uncleaned and shared penetrative sex toys Higher prevalence of bacterial vaginosis Vaginal irritation and trauma in forceful ...


8

A decade ago, a study (1) reviewed the evidence regarding the effect of cycling on impotence (due for example to pudendal nerve entrapment) and the effect of repeated scrotal temperature on spermatogenesis. While sparse evidence suggested a possible link, the author concluded that those results needed to be replicated in larger studies. Some years later, ...


8

She had two periods afterwards so she is not pregnant. Who are you to demand that she take a test? You pretty much called her a liar when you did that. If you can't or won't accept her at her word about being on birth control, not being pregnant, etc, then I recommend you quit sleeping with women you have such a low opinion of.


8

Before going directly into the topic, firstly, it is necessary to comprehend the mechanism of erection, because small fault due to different factors in the mechanism gives rise to its dysfunction. An erection is a complex process. It involves the central nervous system, the peripheral nervous system, psychological and psychological factors, local factors ...


8

Since you have not been rendered blind, you can follow this link which states that it is not intrinsically unhealthy unless it starts to interfere with the way you function socially or at work. In some people it intrudes into their public life and so then might considered an illness. Another form of harm is when it displaces normal sexual activity and some ...


8

First of all, just to be clear: IVF-associated twinning and “tripletting” are most commonly of the dizygotic (“fraternal”) variety. You appear to be asking about monozygotic (“identical”) twinning given the reference to “splitting the egg.” I will provide a brief overview of both. Types of multiple conceptions and relationship to IVF Dizygotic ("fraternal"...


6

This article should give an idea of the likelihood of pregnancy based on the number of sperm available. If you look at the graph of the Probability of Conception vs. the Sperm Concentration, it shows that at more than 10 million sperm/mL (or around 30-40 million total sperm, estimating average semen volume to be 3-4 mL), the probability of conception per ...


6

You can only get HIV from someone or something already infected. This includes humans, needles, breast milk, etc. HIV virus must come in contact with a damaged or open tissue. CDC.gov You can get or transmit HIV only through specific activities. Most commonly, people get or transmit HIV through sexual behaviors and needle or syringe use. You must ...


6

This is a very good and important question, not only for you but for other people as well. As people have said in the comments, YES it can be potentially dangerous to have unprotected sexual encounters with her without having tested for STDs first. Even if she's had unprotected sex with only ONE person, she would've been at risk for an STD. As long as she ...


6

There's no need to worry. Getting pregnant isn't that easy.1 It's unlikely that sperm survive for 2 hours. On a dry surface, such as clothing or bedding, sperm are dead by the time the semen has dried. In water, such as a warm bath or hot tub, they'll likely live longer because they thrive in warm, wet places. But the odds that sperm in a tub of water ...


6

Neither. The percentages given are the percentage of couples using that method who will conceive over a year. So if 100 people use that 98% method, 2 will get pregnant each year. Here is a page from the National Health Service in the UK that explains this as well as providing some numbers for some methods.


5

Yes, anal sex is the most risky method of sex with the highest possible chances for HIV infection. This is clearly said in the official Centers for Disease Control and Prevention website: Anal sex is the riskiest sexual behavior for getting and transmitting HIV for men and women. As for the reason, it's neither the penis nor the anus directly. They ...


5

Fertility awareness methods are slightly different from the others in that they require you to have self control and not have sex when you might otherwise want. Many people don't like to do this. In this study "9.2 per 100 women dropped out because of dissatisfaction with the method". Failure rates very widely depending the method of education, and the group ...


5

The results of our studies, which also included a double-blind randomized control trial, confirm that LI-ESWT generates a significant clinical improvement of erectile function and a significant improvement in penile hemodynamics without any adverse effects Source: Gruenwald, I., Appel, B., Kitrey, N. D., & Vardi, Y. (2013). Shockwave treatment of ...


5

Your back-of-the-envelope calculations seem to be off in estimating the extent of viral load reduction in a treated versus untreated person as well as the risk of transmission for unprotected, untreated sex (5% is much higher than any other number I have seen). Obviously the viral load is not zero because then they wouldn't be HIV positive is not ...


4

Amyl Nitrite Treats and prevents chest pain (angina pectoris). And more pertinent for the question: On the street, this medicine and others like it are sometimes called "poppers." They have been used by some people to cause a "high" or to improve sex. Use in this way is not recommended. Amyl nitrite can cause serious harmful effects if too much ...


4

HSV1 and HSV2 are different strains of the Herpes simplex virus. They both can lead to oral or genital infection. The reason they are usually known as oral (HSV1) and genital (HSV2) herpes are that the majority of genital herpes cases used to be from HSV2. However, this has been changing and now HSV1 is the more dominant genital infection at least in some ...


4

The hepatitis B virus has been found in semen, salivia, and vaginal secretions (as well as in blood, of course). The risk of transmission is lower for oral sex than it is for vaginal or anal sex, but it is not zero. For oral sex with an infected man on the receiving end, a condom is recommended. As for giving oral sex, a dental dam can be used. To reduce ...


4

This answer covers herpes, with both HSV1 (usually appearing and transmitted orally) and HSV2 (usually called genital herpes). So-called "asymptomatic shedding", when the virus can be transmitted despite the carrier not showing any sores, is unfortunately very common in both herpes types. An in my opinion good article is Asymptomatic Shedding of Herpes ...


4

See a doctor. Low libido (the medical term for sex drive) can have medical causes. Two examples among many potential causes are low testosterone or depression. Also Sex therapy (a type of couples psychotherapy) is a type of counseling that is highly recommended in the medical/behavioral health field for couples with differences in sexuality that causes ...


4

Yes they can. Co-occurring conditions like depression may also contribute to low libido. This is a good article that discusses the details. The mechanisms by which antipsychotic drugs may cause sexual dysfunction are as follows: histamine receptor antagonism, dopamine receptor antagonism, dopamine D2 receptor antagonism, cholinergic ...


4

This is a good question, and although as you correctly state that HIV is an STI (see STI vs STD vs Sexually Transmitted Virus?) there is a difference with HIV which is one reason why it may be separated from others. It can be thought that HIV is separated from STIs in factsheet titles etc. because HIV is a virus when others are not, but there are other STI ...


4

Question: If HIV is an STI, then why is HIV often listed separately, for example: HIV & Sexually Transmitted Infections Fact sheet STDs and HIV – CDC Fact Sheet What You Need To Know About the Links Between HIV and STDs Reason 1. The articles linked above have "HIV and STI" or "HIV or STDs" in the titles because they describe how a person with a ...


4

Erections aren't binary, they have a gradient of turgidity; but going by your statement "completely impossible," then I will assume that for your novel you want to understand what would prevent any noticeable degree of erection. As it is a part of the body, the penis will continue to be perfused by the circulatory system as long as the heart is pumping.* ...


4

Older paternal (and maternal) age in fact is associated with some increase in disease, though at fairly low rates. Cancer is largely a disease of probability. One does not need to have mutations in all of their cells to develop cancer, just one. But a parent does not pass on all their mutations in all their cells, they pass on just one, which need not have ...


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