Sex is compulsory for reproduction but it promotes mutual interest, enjoyment, feeling of love and satisfaction for many people. But its harmful and punishable activity, if anybody is molesting or raping others by force which is against the will, individual freedom and interest of others.
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2.
Yes sex is cumpolsory it's a way given by god to us to show our feelings physically.it's not necessary tat sex shud be done in a wild way fer timepass sex can be done with any amount of people on this earth as science has invented preventive measures which will stop harm
sex can be descent slow full of emotion
so sex is cupolsury fer reproduction also even if u don want to do it
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3.
It is a must for reproduction. Unlike animals, since here it happens privately, there is a lot of stories, and add ons. This interest is also a part of divine design, else you will see a reduction in reproduction rate.