Give information about natural methods useful as contraceptive.

$A$ : Periodic abstinence is one such natural method of contraception in which the couples avoid or abstain from
coitus from day $10 \;to\; 17$ of the menstrual cycle, when ovulation could be expected.
$R$ : $Day \;10 \;to \;day \;17$ of menstrual cycle is considered as safe period

The method of sterilisation is

Assertion : $Cu-T$ and $Cu-7$ do not suppresses sperm-motility.

Reason : Hormones released by them affect sperm motility.

Which of the following statement is/are correct about diaphragms, cervical caps and vaults?

$A.$ Barrier methods of contraception

$B.$ Cover the cervix during coitus

$C.$ Protect the user from contracting $STDs$

$D.$ They are reusable