Assertion: After coitus, the sperm travels through the female reproductive system and into the fallopian tubes (also called uterine tubes).
Reason: The ampulla is a part of the fallopian tube where fertilization often occurs, and it is the only site of fertilization.

Assertion is true but reason is false.

During copulation (coitus) semen is released by the penis into the vagina (insemination). The motile sperms swim rapidly, pass through the cervix, enter into the uterus and finally reach the ampullary region of the fallopian tube . The ovum released by the ovary is also transported to the ampullary region where fertilisation takes place.The ampulla is a part of the fallopian tube where fertilization often occurs, but it is not the only site of fertilization. Fertilization can occur anywhere along the length of the fallopian tube. Fertilisation can only occur if the ovum and sperms are transported simultaneously to the ampullary region. This is the reason why not all copulations lead to fertilisation and pregnancy.