Give differences : Physical barrier method and Chemical barrier method

Vasectomy has no effect on the sexual life of male because :

In delaying pregnancy or spacing among children, the ideal contraceptive is

What is the difference in oral contraceptives and hormonal implants?

$A$ : Surgical method also called sterilisation are generally advised for the male/female partner as a terminal method to prevent any more pregnancies.
$R$ : These techniques are highly effective but their reversibility is poor.