Coitus (noun)

1. The act of sexual intercourse between a man and a woman.
2. The physical act of sexual intercourse between two people.

Origin:

From the latin word "coitio" meaning sexual intercourse.

Examples:

1. The couple engaged in coitus in their bedroom.
2. The use of contraception during coitus is important for preventing unwanted pregnancies.
3. Ancient cultures had various rituals and customs surrounding coitus.
4. Coitus interruptus is a method of birth control where the man withdraws his penis from the vagina before ejaculation.
5. Some animals engage in coitus for non-reproductive purposes, such as bonding or dominance displays.