CBSE Class 12-science Answered

STDs are sexually transmitted diseases. They are spread by sexual intercourse. HIV, chlamydia, genital herpes, genital warts, gonorrhoea, some forms of hepatitis, syphilis and trichomoniasis are common STDs. STDs are also called venereal diseases or VD. They are among the most common contagious diseases.

The most common causes of STDs are:

1. You have sex with more than one partner.
2. You have sex with someone who has had multiple partners.
3. You don't use a condom while having sex.
4. You share needles when injecting intravenous drugs.
5. You trade sex for money or drugs.