Webster's New World Medical Dictionary

sex chromosome
See 
chromosome, sex.
sexual addiction
Having an unusually intense
sex drive or obsession with sex that is disruptive and
dominates the addict’s thinking and daily life.
Associated behaviors may include voyeurism, com-
pulsive masturbation, unsafe sex practices, and hav-
ing multiple or anonymous partners. Sexual
addiction can be associated with risk-taking behav-
iors. For some, the addiction involves illegal activi-
ties, such as exhibitionism (exposing oneself in
public), making obscene phone calls, or molesta-
tion. However, sex addicts do not necessarily
become sex offenders. The addict may gain little sat-
isfaction from the sexual activity and often forms no
emotional bonds with sex partners.
sexually transmitted disease
Any disease that
is transmitted via sexual contact; is caused by
microorganisms that survive on the skin or mucous
membranes of the genital area; or is transmitted via
semen, vaginal secretions, or blood during inter-
course. Abbreviated STD. Because the genital area
provides a moist, warm environment that is espe-
cially conducive to the proliferation of bacteria,
viruses, and yeasts, a great many diseases can be
transmitted sexually. STDs include AIDS, chlamydia,
genital herpes, genital warts, gonorrhea, syphilis,
yeast infections, human papillomavirus, and some
forms of hepatitis. Also known as a venereal disease.
See also 
sexually transmitted disease in men;
sexually transmitted disease in women.
sexually transmitted disease in men
Sexually
transmitted disease (STD) as it affects men. Men
can contract all the known STDs but may have no
symptoms or have different symptoms than women
do. For example, most men who have chlamydia
have no symptoms at all but can easily pass the
infection on to their sexual partners.