The most effective method of preventing both stds and pregnancy is: abstinence a long term monogamous relationship condom use oral contraception

Abstinence

Explanation:

The most effective method of preventing sexually transmitted diseases and pregnancy is abstinence. Sexual abstinence is when a person decides not to have sexual contact for a period of time, either for religious reasons or health needs due to some recovery time after surgery, for example. Withdrawal does not cause any harm to health, but there are other very effective methods of preventing disease and pregnancy, such as condoms.

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there are men and women, some choose to be both or change their gender. often times those people go by "other". those who change their gender are known as "transgender"