What Is The Best Medicine To Avoid Pregnancy?

Hello Madam,
I hope I can get answer for my question. I am a 26 year old gye not married. I am looking for some pleasure in life as life is too much boring. I am going out with a girl and planning to have intercourse. Can you please suggest what are the measures I should take in order to avoid pregnancy and be safe.

Also how can I arouse the girl and make her excite. Is it safe to put penis in the mouth or not?

Thanks
prashant
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