A condom is a sheath-shaped barrier device used during sexual intercourse to reduce the probability of pregnancy or a sexually transmitted infection (STI). There are both external (male) and internal (female) condoms.
A rolled-up condom
A giant replica of a condom on the Obelisk of Buenos Aires, Argentina, part of an awareness campaign for the 2005 World AIDS Day
Illustrations showing how to put on a condom
An internal condom
Semen, also known as seminal fluid, is an organic bodily fluid that contains spermatozoa. Spermatozoa are secreted by the male gonads and other sexual organs of male or hermaphroditic animals and can fertilize the female ovum. Semen is produced and originates from the seminal vesicle, which is located in the pelvis. The process that results in the discharge of semen from the urethral orifice is called ejaculation. In humans, seminal fluid contains several components besides spermatozoa: proteolytic and other enzymes as well as fructose are elements of seminal fluid which promote the survival of spermatozoa and provide a medium through which they can move or "swim". The fluid is adapted to be discharged deep into the vagina, so the spermatozoa can pass into the uterus and form a zygote with an egg.
Spermatozoa, in this case human, are a primary component in normal semen, and the agents of fertilization of female ova.
Human semen in a Petri dish
Semen stain on carpet observed with and without ultraviolet light