The diseases which are spread by sexual contact with an infected person are called sexually transmitted diseases(STD)
For Ex:Gonorrhoea,Syphilis(caused by bacteria)
AIDS(Acquired Immuno Deficiency Syndrome)
The Prevention of pregnancy in woman is called contraception.
Any devices or chemical which prevent pregnancy in woman is called Contraceptive.
They prevent the meeting of sperm and egg.
2)Chemical Method:The female uses 2 types of pills-oral and vagina.
Oral pills are made of specific hormones which prevent release of egg into oviduct.
Vaginal pills contain chemical which kill the sperm.
The use of IUCD is placed inside the uterus.It prevents the implantation of fertilised egg in uterus.
In male a small portion of sperm duct is removed by operation and both the cut ends are tied property.This prevents sperm from coming out.(VESECTOMY)
In female a small portion of oviduct is removed.It prevent the egg from entering into oviducts.(TUBECTOMY)