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Saline breast implant

A breast implant filled with saline solution and made with a reinforced silicone rubber shell that is either smooth or textured.


A serious mental disorder that causes people to interpret reality abnormally, manifesting as a combination of hallucinations, delusions, and severely disordered thinking and behavior.


The pouch that surrounds the testicles, acting as both protection and an air conditioner to keep them cooler than overall body temperature.

Selective serotonin reuptake inhibitors (SSRIs)

A class of drugs typically used to treat depression, anxiety and other disorders related to serotonin deficiencies.


Fluid emitted from the male reproductive tract that carries and protects sperm cells during ejaculation.

Semen analysis

A microscopic examination of sperm to assess sperm count, shape and movement.

Semen retention

The act of avoiding ejaculation for perceived benefits such as increased sex drive and energy levels, among others.

Seminal vesicles

Glandular pouches, one on each side of the male reproductive tract, that secrete a fluid containing sugar and protein into the ejaculatory duct.

Seminoma tumor

A type of cancer that originates in the germ cells of men.


A buildup of clear fluid in a wound.


A neurotransmitter that influences mood, cognition, reward, learning, memory and other physiological processes; known to facilitate a sense of well-being and stabilize mood changes.

Sessile serrated polyps/traditional serrated adenomas

Colorectal polyps that are usually considered precancerous.

Sexually transmitted disease (STD)

An infection transmitted through sexual contact, caused by bacteria, viruses or parasites.

Sexually transmitted infection (STI)

An infection transmitted through unprotected sexual contact with someone who’s infected.

Simple fibroadenomas

Solid, noncancerous breast lumps that appear the same all over when examined under a microscope and are smooth to the touch.

Simple (total) mastectomy

A procedure in which the surgeon removes the entire breast, including the nipple, areola and skin, in order to treat breast cancer.

Skin-sparing mastectomy

A procedure used to treat breast cancer in which the breast tissue, nipple and areola are removed, but most of the skin is spared; often used in cases where the patient plans to get breast reconstruction surgery.


Thick, white, cheesy substance that collects under the foreskin of the penis or in the vaginal area; most common in uncircumcised men due to poor hygiene.


A medical instrument designed to be inserted into a body passage to facilitate visual inspection.

Spermatic cord

A cord by which the testicles are suspended in the scrotum.

Sperm density

The number of sperm per milliliter of semen.

Sperm motility

The ability of sperm to swim normally.

Substance abuse

An act that occurs when an individual uses drugs or alcohol in an illicit or addictive manner, or in a way the substance is not supposed to be used.

Substance use disorder

A disease in which an individual compulsively uses substances or engages in behaviors that can cause health issues and social consequences.

Surgical menopause

The immediate induction of menopause brought on by the removal of the ovaries, a woman’s primary source of estrogen.