Final answer:
The sheath used to line the vagina during intercourse is called a female condom, a type of barrier method of birth control that is worn internally by a woman.
Step-by-step explanation:
Birth control sheath used to line the vagina during intercourse is called a female condom. It is a type of barrier method of birth control that is worn internally by a woman. The female condom is made of polyurethane and is designed to prevent pregnancy and protect against sexually transmitted infections (STIs).
The female condom works by creating a physical barrier that prevents sperm from entering the vagina and reaching the eggs. It is inserted into the vagina before intercourse and can be used with or without spermicide. Like the male condom, the female condom should be properly fitted and used correctly to ensure its effectiveness.
In addition to the female condom, there are other types of birth control methods that can be used for pregnancy prevention. These include the male condom, oral contraceptives (birth control pills), intrauterine devices (IUDs), and hormonal methods such as the patch or vaginal ring. It is important for individuals to choose a birth control method that suits their needs and to use it consistently and correctly to effectively prevent pregnancy and protect against STIs.